->''"You've activated my trap card!"''

The ''Yu-Gi-Oh'' collectible card game first appeared in the [[Manga/YuGiOh manga of the same name]] as a {{homage}} to ''MagicTheGathering'', of which author Kazuki Takahashi is a fan. Originally, the manga was intended to feature a new game every few weeks, and with the trading cards being just one of many. However, Takahashi received a lot of fan mail asking how to play it, and so he cobbled together a rudimentary game system loosely based on that of ''Magic'' which [[NewRulesAsThePlotDemands generally]] agreed with how the characters played. Fan mail kept pouring in, and so the editor of ''Shonen Jump'' (in which the manga was serialised) [[ExecutiveMeddling persuaded]] Takahashi to rework the premise of the manga to be about the cards. When the [[AnimatedAdaptation anime]] proved a surprise international hit, {{Konami}} was approached to produce a real version of the game, which was released in 1999. The real game made considerable changes to the rules originally established by Takahashi, and so the manga and anime were revised to more closely reflect the rules of the real game.

''Yu-Gi-Oh'' is essentially a game with different names and administration structures in different territories. The so-called ''Official Card Game'', or OCG, has been handled by Konami since the beginning; it administers East Asia. The other administration setup, called the ''Trading Card Game'' or TCG, was originally manufactured and distributed by Upper Deck Entertainment, at Konami's own behest, throughout the remaining territories worldwide. However, in 2008, UDE lost the license amid some allegations of wrongdoing, and now the TCG is administered by Konami as well. The game is roughly 99% identical on each side of the Pacific; the only differences are that some cards that debut under one administration do not appear in the other for a good, long while, if ever; and, Konami alters some card artwork to prevent incidents with MoralGuardians.

Some of the core gameplay elements:

* Deckbuilding: Players construct their own decks, which must contain between 40 to 60 cards and no more than three of any single card ([[http://yugioh.wikia.com/wiki/March_2013_Lists certain cards are limited to 2, 1, or 0 copies per deck]]). A secondary deck of no more than 15 cards can also be constructed; this "Extra Deck" contains "Fusion Monsters," "Synchro Monsters" and "Xyz Monsters" which are summoned to the field by combining other monsters in various ways.
* Monster combat: Players can summon monsters to fight the opponent. Stronger monsters have summoning requirements, most commonly a sacrifice of other monsters.
* Card effects: Most monsters have special abilities aside from their brute force, which is almost always helpful for its wielder, such as the ability to destroy other cards, or to increase its attack strength from its default level. Spell cards are cards that are played directly from the hand with beneficial effects. Trap cards also have special effects similar to Spells; however, they must be set face-down, and then activated later at a later time, which leads into...
* Hidden information: Monsters, spells, and traps can be "Set" face-down on the field to be revealed later, often springing a nasty surprise on the opponent. Recent releases have also increased the number of cards playable from one's hand at atypical, poignant, and decisive points of gameplay - essentially behaving like a "Set" card that didn't have to be "Set". Considering how removing and playing around Set cards was one of the game's dominant paradigms for nearly a decade running, these recent releases, when competitive, have had ''quite'' the impact.

A more complete overview of the rules can be found [[UsefulNotes.YuGiOh at this Useful Notes page]], the stories and tropes from the metaplot [[Metaplot/YuGiOh can be seen here]], and the character sheet from said metaplot is at [[Characters.YuGiOhCardGame this Character Sheets page]]. Subjective tropes can be found [[YMMV/YuGiOhCardGame here.]] Trivia can be found [[Trivia/YuGiOhCardGame here.]]

For the card game based off the [[Anime/YuGiOhFirstAnimeSeries first anime]], try [[TabletopGame/YuGiOhCarddasVersion Yu-Gi-Oh! (Carddas Version)]].

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!!This game provides examples of
* AchillesHeel: Some cards have deliberate weaknesses to keep things interesting and keep them from becoming too powerful. The Earthbound Immortals are all very strong, unable to be attacked and can attack the opponent directly, but automatically destroy themselves if there's no Field Spell card on the field. Cloudians must remain in attack position or they also destroy themselves.
** In the metagame, this trope is present through deck match ups, and side decking. The most prominent example of this tropes in competitive scene are perhaps, the Dark World, a deck which is extremely fast, powerful, and can utterly wreck the first duel of the match. However, after said first match, side in Shadow Imprisoning Mirror and watch as they struggle against it.
* ActionGirl: Several. There are lady warriors, spellcasters, fiends, spirits, fairies... and each of them can kick just as much ass as the male cards, or in some cases even more!
* AlienInvasion: The point of the [[http://yugioh.wikia.com/wiki/Alien Alien]] monsters.
** Also the [[http://yugioh.wikia.com/wiki/Worm#Reptile-Type_Worms Worm]] monsters.
* {{Amazon|ianBeauty}} [[AmazonBrigade Brigade]]: The [[http://yugioh.wikia.com/wiki/Amazoness Amazoness]] archetype. Loads of scantily-clad, athletic, muscular warrior women.
* AnotherDimension: The D.D. (Different Dimension) cards.
* {{Antimatter}}: WordOfGod is that the Xyz monsters are made up of this.
* ArtificialStupidity: The gimmick of the Karakuri archetype is that they must attack if able (even if it would get them killed) and always shift into defense when attacked (even when their defense is lower, and they would survive if they counterattacked).
* AttackReflector: Available in [[http://yugioh.wikia.com/wiki/Reflect_Bounder monster]] or [[http://yugioh.wikia.com/wiki/Mirror_Force trap]].
** [[http://yugioh.wikia.com/wiki/Attack_Reflector_Unit Attack Reflector Unit]], which trades in Cyber Dragon for Cyber Barrier Dragon.
* AwesomeButImpractical: [[AwesomeButImpractical/YuGiOh Subpage here.]]
* AwesomeMcCoolname: [[http://yugioh.wikia.com/wiki/Super-Nimble_Mega_Hamster Super-Nimble Mega Hamster]].
** [[http://yugioh.wikia.com/wiki/Red-Eyes_Darkness_Metal_Dragon Red-Eyes Darkness Metal Dragon]]
** [[http://yugioh.wikia.com/wiki/Chaos_End_Ruler_-Ruler_of_the_Beginning_and_the_End- Chaos End Ruler -Ruler of the Beginning and the End-]]
** [[http://yugioh.wikia.com/wiki/Chaos_Emperor_Dragon_-_Envoy_of_the_End Chaos Emperor Dragon-Envoy of the End]]
** [[http://yugioh.wikia.com/wiki/Super_Dimensional_Robo_Galaxy_Destroyer Superdimensional Robot Galaxy Destroyer]]
* AwesomeYetPractical: Beast King Barbaros, a 3000 ATK monster that can wipe out all opposing cards if you tribute summon it with three tributes instead of the normal two. What makes it awesomely ''practical'' is that it can also be summoned from the hand at 1900 ATK (the ATK of a very strong Level 4 monster) with no tributes, so it's never useless in the hand if you have no tribute fodder, unlike virtually every other high-level monster. Its ATK will also reset to 3000 if its effect on the field is negated (as if by "Skill Drain,") so you could potentially drop a 3000 ATK monster on the field with no tributes--''very'' practical.
** Better yet, instead of skill drain, equip it with the card "Axe of Fools". In addition to giving it 1000 ATK, it will also negate the effect just like skill drain, giving you a 4000 ATK monster with only two cards.
** The [[SpotlightStealingSquad Elemental Heroes]] now have fusion monsters for every Attribute save [[InfinityPlusOneElement Divine]]. This means that, combined with Super Polymerization (which lets you fuse using your opponents' cards as material), you can steal just about any monster your opponent can throw at you, save for those who are explicitly protected from particular selection.
** A lot of top tier decks operate on this trope. In fact, the "awesome" strategies they use can be categorized further as boring-type awesome and purely awesome. Boring-type awesome are usually a deck that uses same, consistent and effective set of strategy and gameplans to win the game (notably Six Samurai which does nothing but play Shi En, Kizan rush, protect Shi En, win game), while the latter plays depend on the card in your hand, and the condition of the field to bring the best result (Plants Synchro, which is, basically, put together a set of card that works well together to create a chain of game winning plays).
** Thunder King Rai-Oh. It can Tribute itself to negate a Special Summon, shutting down [=XYZs=] and Synchros, disallows player to add cards from their Decks to their hands outside of drawing, shutting down searchers like Sangan, and has 1900 attack, enough to run over most anything that hasn't been Special Summoned, and when those ones come out, re-read its first effect. It's also a level 4, has no summon restrictions and it's Light attribute to support decks that need them including Chaos.
** Five-Headed Dragon. A 5000 attack beast that uses any five dragons for his Fusion materials, any deck running a decent amount of dragons can splash in a Dragon's Mirror and use it in the late-game for an instant beatstick guaranteed to hit for heavy Life Point damage unless the opponent stops it or only has defense cards.
** Future Fusion embodies this. It's a fusion card, but instead of fusing from your hand, field, and graveyard like most fusion cards, it fuses from your deck itself. What's even better is you have to wait two Standby Phases until the monster is summoned, giving you time to use a banishing fusion card like Overload Fusion, Gem-Knight Fusion, or Dragon's Mirror to summon a second copy, which is especially deadly with cards like Chimeratech Overdragon or Five-Headed Dragon.
* BadassAdorable: Several fairy type cards.
* BadassGrandpa: For example, [[http://yugioh.wikia.com/wiki/Grandmaster_of_the_Six_Samurai Grandmaster of the Six Samurai]].
* BadassNormal: Literally with Normal monsters like [[http://yugioh.wikia.com/wiki/Alexandrite_Dragon Alexandrite Dragon]] and [[http://yugioh.wikia.com/wiki/Gene-Warped_Warwolf Gene-Warped Warwolf]] for breaking the 'Level 1-4 monsters with 2000 ATK or more getting a negative effect' rule, and we can't forget to mention [[http://yugioh.wikia.com/wiki/Blue-Eyes_White_Dragon these]] [[http://yugioh.wikia.com/wiki/Red-Eyes_Black_Dragon three]] [[http://yugioh.wikia.com/wiki/Dark_magician guys]], the former being this games best example for having the highest ATK of all Normal monsters.
* BadExportForYou: The European releases of the first few booster packs were missing several cards. Fortunately, these were restored in later releases.
** The Duelist Pack sets [[http://yugioh.wikia.com/wiki/Duelist_Pack_6:_Jaden_Yuki_3 Jaden Yuki 3]] and [[http://yugioh.wikia.com/wiki/Duelist_Pack_7:_Jesse_Anderson Jesse Anderson]] contained five less cards in their TCG releases.
** Many of the more recent structure decks are like this, either being edited to remove high-rarity cards, or in two cases scrapping the deck altogether and importing the new cards in them as add-ons to normal sets.
** The TCG missed out on the chance to get Dark Magician Girl as drawn by Kazuki Takahashi in the 10th anniversary pack. Justified, however, because Takahashi refused to bow to ExecutiveMeddling to have DMG censored.
* BarrierWarrior: Big Shield Gardna, Mid Shield Gardna, Shield Warrior… okay, pretty much anything with the word "shield" in its name. Millennium Shield is a Warrior-type…and a literal shield.
** And, of course, there are many monsters that can't be destroyed by battle, like [[http://yugioh.wikia.com/wiki/Marshmallon Marshmallon]], so they're essentially a pseudo-unbreakable shield.
** [[http://yugioh.wikia.com/wiki/Total_Defense_Shogun Total Defense Shogun]] is probably the best example, as it's the first (of two) card stated to be able to attack while in Defense Mode.
** Some monsters cannot be targetted for attacks if there is a certain type or archetype on the field, or keep the opponent from attacking monsters of certain types (Solar Flare Dragon, Marauding Captain, Morphtronic Magnen). Getting two or more of the specific card can block nearly all potential attacks.
* BigDamnHeroes: Some cards have effects that emulate this trope. For example, [[http://yugioh.wikia.com/wiki/Gorz Gorz - Emissary Of Darkness]] is special summoned when you take damage while having nothing on your field, and [[http://yugioh.wikia.com/wiki/Starlight_Road Starlight Road]] negates the destruction of two or more cards and special summons a Stardust Dragon from you extra deck. Not surprisingly, both cards are part of the MetaGame for that exact reason.
** The [[http://yugioh.wikia.com/wiki/Sacred Sacreds]] are a group of holy space knights that came from nowhere to defeat the [[TheCorruption corrupted Verz monsters]] destroying the Duel Terminal world... except, since Sacred Castor also [[http://yugioh.wikia.com/wiki/Verz_Castor got corrupted]] [[http://yugioh.wikia.com/wiki/Sacred_Meteor when he tried to prevent Sacred Pollux from getting infected]], they seem to be losing.
* BlackKnight: [[http://yugioh.wikia.com/wiki/Black_Luster_Soldier Black Luster Soldier]] and [[http://yugioh.wikia.com/wiki/Black_Luster_Soldier_-_Envoy_of_the_Beginning Black Luster Soldier-Envoy of the Beginning]]
* BlackMagicianGirl: TropeNamer, known in English as the Dark Magician Girl.
* BlindIdiotTranslation: Frequent on the early cards, many of which seem to have been translated by [[TheyJustDidntCare people who had absolutely]] ''[[TheyJustDidntCare no]]'' [[TheyJustDidntCare idea what they were doing.]] Among the most obvious examples is "Dunames Dark Witch," which is a ''[[NonIndicativeName Light-Attribute Fairy.]]'' Its original Japanese name is "Dynamis Valkyria". The fact that a card named "Valkyrie" became "Dark Witch" in the US suggests the origins of this mistake; all the same, it's no less unforgivable, especially since "Dark Valkyria" and "Magician's Valkyria" came out in English without any such mistakes.
** Fan translations can be guilty of this as well, such as the infamous "[[http://yugioh.wikia.com/wiki/Number_17:_Leviathan_Dragon Revise Dragon]]".
* BlowYouAway: A vast number of cards that deal with destroying other Spell or Trap cards happen to be named after wind effects, like [[http://yugioh.wikia.com/wiki/Mystical_Space_Typhoon "Mystical Space Typhoon"]], [[http://yugioh.wikia.com/wiki/Heavy_Storm "Heavy Storm"]], [[http://yugioh.wikia.com/wiki/Dust_Tornado "Dust Tornado"]], [[http://yugioh.wikia.com/wiki/Wild_Tornado "Wild Tornado"]], [[http://yugioh.wikia.com/wiki/Twister "Twister"]], and so on.
** As are two of the most popular "bounce" cards, [[http://yugioh.wikia.com/wiki/Giant_Trunade Giant Trunade]] and [[http://yugioh.wikia.com/wiki/Raiza_The_Storm_Monarch Raiza the Storm Monarch]].
** Don't forget [[http://yugioh.wikia.com/wiki/Elemental_HERO_Storm_Neos Elemental HERO Storm Neos.]]
** There are archetypes that has this theme, examples are the [[http://yugioh.wikia.com/wiki/Harpies Harpies]] and the more recent [[http://yugioh.wikia.com/wiki/Gusto Gusto]].
* BoringButPractical:Normal monsters, in general. They have no effects but often have good combat stats, and there's a lot of support for them, including lots of ways to summon them from the Graveyard. Decks based around them focus on brute force rather than anything fancy.
** Gadgets for a long time plays on this. The goal of the deck is to make the game as simple as possible by playing one for one destruction card and with the help of gadgets self replenishing effect gain advantage and win effortlessly. Such deck can be really boring to play with but its really effective when played correctly.
** Ironically, see the AwesomeButImpractical entry. Read Machina Force there ? Sure, summoning it is downright hard to the point of pointless, but nobody said you cant discard it for Machina Fortress revival effect. As a bonus, since its a Machina, some Machina support can work with it, creating some sorts of synergy.
* BottomlessPits: [[http://yugioh.wikia.com/wiki/Bottomless_Trap_Hole Bottomless Trap Hole]], especially since it's one of the most used cards in the game.
* {{Bowdlerize}}: In Japan, the Fairy type is actually Angel type (Tenshi-zoku).
** What we know as Fiends, the Japanese know as Demons (Akuma-zoku).
** What we know as Archfiends, the Japanese know as Daemons (Dēmon).
** What we know as Zombies, the Japanese know as Undead - but the katakana got messed up, resulting in "Undeat" (Undeat-zoku).
** Yu-Gi-Oh! 3D Bonds Beyond Time brought us the Sin archetype, known internationally as Malefic monsters. "Sin" was written in English on the Japanese cards, with furigana as a pronunciation guide; further, there is no explicit "Si" sound in Japanese, and "Shi" is a usual stand-in, so the furigana guide was written as "Shin" - WordOfGod takes this as an intentional pun between "Sin" and "Shin", a Kanji denoting truth. The pun was LostInTranslation.
** Many cards in the OCG that portray nudity, religion, guns, blood, bustiness, etc. were modified in the TCG release. Modified cards are listed [[http://yugioh.wikia.com/wiki/List_of_modified_cards here]].
** Generally, if you see a card with "Des" as part of the name (Except for Dark Ruler Ha Des), chances are that it was "Death" in the OGC.
** [[InconsistentDub Inconsistent Bowdlerization]]: [[http://yugioh.wikia.com/wiki/Eria_the_Water_Charmer Eria the Water Charmer]] and [[http://yugioh.wikia.com/wiki/Wynn_the_Wind_Charmer Wynn the Wind Charmer]] have their skirts lengthened on the [[http://yugioh.wikia.com/wiki/Card_Artworks:Raging_Eria Raging Eria]] and [[http://yugioh.wikia.com/wiki/Card_Artworks:Storming_Wynn Storming Wynn]] cards, but not on their normal or [[http://yugioh.wikia.com/wiki/Familiar-Possessed_-_Eria Familiar-]][[http://yugioh.wikia.com/wiki/Familiar-Possessed_-_Wynn Possessed]] cards.
* BroughtDownToNormal: Almost literally; the continuous trap Skill Drain negates the effects of all monsters on the field.
** BroughtDownToBadass: A 3000 ATK monster with no effects is still a 3000 ATK monster; nothing to sneeze at. Skill Drain also happens to negate any ''negative'' effects the card may have, too, so a lot of monsters actually benefit from Skill Drain.
* BuffySpeak: There's a card named [[http://yugioh.wikia.com/wiki/Interplanetarypurplythorny_Dragon Interplanetarypurplythorny Dragon]].
* BulletSeed: [[http://yugioh.wikia.com/wiki/Seed_Cannon Seed Cannon]] gains counters every time a Plant is summoned (and plants are fairly good at swarming); sending the card to the graveyard damages the opponent the more counters are on it.
* ButtMonkey: [[http://yugioh.wikia.com/wiki/Goblin_Attack_Force Goblin Attack Force]] and [[http://yugioh.wikia.com/wiki/Goblin_of_Greed Goblin of Greed]] in the art of some of the other cards and the [[http://yugioh.wikia.com/wiki/Ojamas Ojamas]].
* CallARabbitASmeerp: Camel-like monsters are known as "Lacoodas" in the international releases. Back when the game was still in its BlindIdiotTranslation stage, someone translated the Japanese "rakuda" (camel) as "Lacooda," and the term apparently caught on, as it's continued to be used even after the translations have gotten better.
** Justified in that the original does not say "rakuda"; it says "rakuuda," and in katakana no less, implying that the name is meant to be a play on "rakuda" rather than the actual word. Still a case of LostInTranslation, as a similar pun could have been used for the English version (but then, given it first happened in Pharaonic Guardian, arguably the nadir for the game's translation quality, it's entirely possible there was no one on staff who would have ''recognized'' it as a pun).
* CaptainErsatz: Does [[http://yugioh.wikia.com/wiki/Battlestorm Battlestorm]] [[VideoGame/{{F-Zero}} look familiar]]?
** There are not [[http://yugioh.wikia.com/wiki/Zombyra_the_Dark one]], but [[http://yugioh.wikia.com/wiki/Elemental_HERO_Necroshade two]] for {{Spawn}}. The first one is an indirect example, because it's based on a fictional superhero comic from the manga, that was based on Spawn. The second one was directly based on Spawn himself.
** Likewise, [[http://yugioh.wikia.com/wiki/Tactical_Espionage_Expert Tactical Espionage Expert]] is quite deliberately [[Franchise/MetalGear Solid Snake]] in all but name.
* [[CastFromHitPoints Cast From Life Points]]
** Many cards require a sacrifice of life points to activate.
** Nearly taken to an extreme with Toon World; the entirety of its text is "Pay 1000 Life Points to activate this card." That's it. Sure, now you can summon your Toon monsters [[note]]some don't need it to be in the field to be…well, on the field[[/note]], but other than that, it just kinda sits there waiting to be destroyed.
** This is practically the Psychic-Type's main gimmick, with frequent payments to either fire off or maintain their effects. To balance this out, a good amount of their support cards involve healing.
** Some cards, like the Archfiend archetype from ''Dark Crisis'', require a life point payment to keep them on the field. A life point payment ''that is not optional''.
* CherryTapping: The "[[http://yugioh.wikia.com/wiki/Sparks Sparks]]" card does a measly 200 points of damage to the opponent--that's it. Most video game versions of ''TabletopGame/YuGiOh'' reward you with a bonus if you ever manage to finish off the opponent using "Sparks." They give a similar bonus if you manage to finish off the opponent with a Skull Servant, but at least you can give Skull Servant some good equip spell cards to boost its power.
* ChessMotifs: The first [[http://yugioh.wikia.com/wiki/Archfiend Archfiend]] monsters released in the ''Dark Crisis'' pack. Their top support card is [[http://yugioh.wikia.com/wiki/Checkmate Checkmate]].
* CollectibleCardGame
* ColorfulThemeNaming: The Dark World archetype. Complete with Dark Overlord Reign-Beaux.
* CombiningMecha: The VWXYZ archetype, culminating with the [[http://yugioh.wikia.com/wiki/VWXYZ-Dragon_Catapult_Cannon Dragon Catapult Cannon]], the [[http://yugioh.wikia.com/wiki/Machina_Force Machinas]] and the [[http://yugioh.wikia.com/wiki/Valkyrion_the_Magna_Warrior Magnet Warriors]], but ''[[{{Pun}} technically]]'' speaking, any Machine-type Fusion monster could be seen as this.
* ContestWinnerCameo: Quite a few cards are designed by fans.
* ContinuityDrift: Early cards with remove from play effects, such as [[http://yugioh.wikia.com/wiki/Bazoo_the_Soul_Eater Bazoo the Soul Eater]] and [[http://yugioh.wikia.com/wiki/Kycoo_the_Ghost_Destroyer Kycoo the Ghost Destroyer]], implied that monsters removed from play had their souls destroyed. More recent cards indicate that those monsters are actually sent to another dimension.
* CoolBoat: Holy damn, [[http://yugioh.wikia.com/wiki/Number_50:_Blackship_of_Corn Number 50: Blackship of Corn]].
** [[GhostShip Ghost]] [[http://yugioh.wikia.com/wiki/Ghost_Ship Ship]] and [[http://yugioh.wikia.com/wiki/Yomi_Ship Yomi Ship]] also count.
* CoolPlanes: The recent archetype Phantom Beast Planes.
* TheCorruption: The [[http://yugioh.wikia.com/wiki/Verz Verz Archetype]] is based around monsters corrupted by the Verz virus. This includes the infamous original Duel Terminal monster, [[http://yugioh.wikia.com/wiki/Brionac%2C_Dragon_of_the_Ice_Barrier Brionac, Dragon of the Ice Barrier]], which has mutated into [[http://yugioh.wikia.com/wiki/Verz_Bahamut Verz Bahamut]].
** [[http://yugioh.wikia.com/wiki/Warrior_Dai_Grepher Warrior Dai Grepher]] is corrupted into [[http://yugioh.wikia.com/wiki/Dark_Grepher Dark Grepher]] and then further into the [[http://yugioh.wikia.com/wiki/Dark_Lucius Dark Lucius Archetype]]
* CrazyPrepared: "Toolbox" is a type of deck that specializes on searching monsters with many unique (and sometimes situational) effects directly from the Deck or Graveyard to counter your opponent. For example, [[http://yugioh.wikia.com/wiki/Gladiator_Beast Gladiator Beasts]] can "[[FanNickname Tag Out]]" after a battle and bring any other Gladiator Beast from the Deck, and Koa'ki Meirus can use [[http://yugioh.wikia.com/wiki/Koa%27ki_Meiru_Urnight some]] [[http://yugioh.wikia.com/wiki/Iron_Core_Specimen_Lab cards]] to get any monster they want, including a trio that literally [[http://yugioh.wikia.com/wiki/Koa%27ki_Meiru_Wall can]] [[http://yugioh.wikia.com/wiki/Koa%27ki_Meiru_Sandman stop]] [[http://yugioh.wikia.com/wiki/Koa%27ki_Meiru_Guardian anything]].
* CreationSequence: Depicted in [[http://yugioh.wikia.com/wiki/Terraforming Terraforming]].
* CripplingOverspecialization: Some cards exist simply to counter other, very specific cards and are otherwise worthless. "Anti Raigeki" exists only to counteract "Raigeki", "White Hole" only exists to counteract "Dark Hole", and both "Call of Darkness" and "Call of the Grave" exist only to counter "Monster Reborn".
** However, not all specializations are crippling; for example, "G.B. Hunter," designed to lock down a Gladiator Beast deck, still has enough DEF to serve as a desperate defense. Likewise, because "Monster Reborn" was first printed in the OCG on March 27, 1999, and wasn't first Semi-Limited until April 1, 2000, its own specific counters spent a few months in a rather less crippled state.
** The Allies of Justice appear to be an entire archetype based around overspecialization. Their effects almost exclusively revolve around the opponent's monsters being LIGHT-attribute or face-down. If they're not facing something with those criteria, they're in a lot of trouble. Note that the Worms are all LIGHT-attribute monsters with a lot of flip effects, meaning the Allies of Justice were designed to just fight this one enemy and nothing else!
** Most of the "HERO" support cards have ''really'' specific conditions, which hampered the deck's playability for quite some time.
* CrossoverCosmology: There are cards based on Egyptian, Greek, Roman, Celtic, Chinese, Indian, Japanese, Incan and Norse mythology, among others. Well, when we say 'based', we mean 'has some small detail in common with'.
** [[JustifiedTrope Justified]] in the anime, as Pegasus (the creator of the game in the anime) claims to have based most of the cards on various inspirations, including the myths he encountered on his world tour.
* CuteIsEvil: Several fiend type or darkness attribute cards can be this.
* CuteMonsterGirl: A few, but probably the best example is [[http://yugioh.wikia.com/wiki/Tour_Guide_From_the_Underworld Tour Guide from the Underworld]], because she's, you know, a ''demon''.
* CyberneticsEatYourSoul: Gagagigo's eventual fate. He gets [[http://yugioh.wikia.com/wiki/Awakened_Brave_Warrior_-_Gagagigo better]].
* DarkIsEvil: The DARK attribute has the greatest portion of evil-seeming monsters, but…
** DarkIsNotEvil: quite a few heroic cards, notably [[http://yugioh.wikia.com/wiki/Zombyra_the_Dark Zombyra]] [[http://yugioh.wikia.com/wiki/A_Hero_Emerges the Dark]], the [[http://yugioh.wikia.com/wiki/Destiny_HERO Destiny HEROs]], the Dark Magician family, and the [[http://yugioh.wikia.com/wiki/Allies_of_Justice Allies of Justice]], are also DARK.
** The flavor text of [[http://yugioh.wikia.com/wiki/Zure,_Knight_of_Dark_World Zure, Knight of Dark World]] seems to indicate that he's [[NobleDemon evil, but fair.]] WordOfGod says that all Dark World monsters are noble and good, they just ''look'' hideous and evil.
** The Allies of Justice are all DARK-Attribute, in spite of being, you know, [[ExactlyWhatItSaysOnTheTin allied with justice.]]
* DeaderThanDead: Cards removed from play generally won't be seen again in the duel unless your deck is specifically designed to recycle them.
* DeathOrGloryAttack: Meta-version: the spell card [[http://yugioh.wikia.com/wiki/Power_Bond Power Bond]] often inflicts such hefty damage on its user that when used, most prefer to end the game on the turn it's used. There's the tangentially related [[http://yugioh.wikia.com/wiki/Limiter_Removal Limiter Removal]], which destroys all monsters it affects at the end of the turn. Naturally, the two are often combined with cards such as [[http://yugioh.wikia.com/wiki/Cyber_End_Dragon Cyber End Dragon]] or [[http://yugioh.wikia.com/wiki/Ultimate_Ancient_Gear_Golem Ultimate Ancient Gear Golem]] to crush the opponent.
* DeathWorld: The "Venom Swamp" field spell card will slowly kill ''everything'' on the field except the native Venom monsters. The "Zombie World" field spell card causes everything to count as zombies (even in the graveyard!) so it could be called an Undeath World.
* {{Defictionalization}}: The card game itself, initially intended as a one-shot game in the manga. [[WhatCouldHaveBeen Averted with the hundreds of cards that were never made outside of the anime and/or manga.]]
** Masked [=HEROs=] and Vision [=HEROs=], formerly manga-only cards, have finally started appearing as alternative support cards to Elemental [=HEROs=].
* DemBones: The [[http://yugioh.wikia.com/wiki/Skull_Servant Skull Servant]] and related cards, along with numerous other Zombie-types.
* DepartmentOfRedundancyDepartment: The "Ninjitsu Art" cards and Thunder King Rai-Oh. "Ninjitsu" means "Ninja Art" and "Rai-Oh" means "Thunder King".
* DidYouJustPunchOutCthulhu: Some monsters' relative ATK scores aren't exactly what you'd expect. For example, [[http://yugioh.wikia.com/wiki/Genesis_Star_God%2C_Sophia the supreme god of the Duel Terminal planet]] can be punched out by [[http://yugioh.wikia.com/wiki/Roaring_Express_Train_Rocket_Arrow a train]] or [[http://yugioh.wikia.com/wiki/Master_of_Oz a giant koala]][[note]]Said god's effect does make getting out said train or giant koala an uphill battle[[/note]].
* DifficultButAwesome: The Koa'ki Meiru monsters all have high attack power and incredibly useful anti-meta effects and support cards. What makes them difficult to use is that they all destroy themselves at the end of the turn if you don't discard the Iron Core card or reveal a card in your hand that's the same type as the monster on the field (and there are many different types of Koa'ki Meiru monsters!). It's difficult to have more than just one Koa'ki Meiru out on the field at any given time, though they can still be quite effective if you splash them into another deck full of the same monster type as them so they don't self-destruct.
** It gets worse: the Iron Core itself is completely useless, but is required to use powerful Spell or Traps, so sooner or later you're bound to have to decide between a monster or keeping a way to use your Spell or Trap. Even worse, a few of those need the Core in your ''Graveyard'' instead, so if you're using ''those'', you could end up with no ways to use the ones that need them in your hand.
** All of the above problems are partially addressed by the way the TCG's releases have approached the Rock-Type Koa'ki Meiru monsters. The OCG, at most, has 3 Koa'ki Meiru for each Type, which makes it slightly difficult to try to use a Koa'ki-monster-heavy deck yet avoid the nigh-uselessness of the Core itself. One thing the OCG did bring to the table early was Boulder - a recruiter that never needs to be maintained via core or card-revealing. That, combined with the trend set by Guardian and Sandman in terms of activation negation, led to what may be the most significant thing Koa'ki Meiru has right now - a means of game control via stopping activations. The TCG continued that trend by releasing another maintenance free Koa'ki (Prototype), and another activation-stopping Koa'ki (Wall). This leaves the Rock-Type branch with five members on this side of the Pacific - all of which either help control the game or give you resources.
** Another ideology to use with the Ko'aki Meiru monsters is to throw them into decks among their own types. Bergzak gets excellent mileage among Warrior decks.
** Vennominaga the Deity of Poisonous Snakes requires a lot of set-up; a reptile-based deck, a card like "Damage = Reptile" to easily summon its predecessor Vennominion, a pre-set "Rise of the Snake Deity" to summon Vennominaga when Vennominion gets destroyed, a card to destroy Vennominion and perhaps a use of "Snake Rain" to flood your Graveyard with Reptiles to boost Vennominaga's attack. Once all that is said and done, however, Vennominaga is virtually unstoppable since it is ''completely'' immune to all card effects, and it needs only to damage the opponent three times for an instant win. The only hope the opponent has is to either summon a monster that Vennominaga can't overpower, or to find a way to get those reptiles out of the graveyard (such as with "Zombie World" or "Soul Release").
** [[http://yugioh.wikia.com/wiki/Sophia_the_Creator Sophia the Creator]] is considered this for having harsh summoning requirement of banishing one Fusion, one Ritual, one Synchro and one Xyz on the field. However, once it hits the field, ''all other cards on the field, graveyard and hand are banished except itself''. Not to mention its summon and effect cannot be negated.
** Probably the most overwhelming example of this trope, however, is [[http://yugioh.wikia.com/wiki/The_Creator_God_of_Light,_Horakhty Horakhty, the Creator God of Light]]. To summon it you have to have all 3 of the Egyptian God Cards on the field...with the "card copying its name" trick ''explicitly negated'' to prevent this from being any easier than getting out 3 monsters who require 3 monsters a piece to summon. It's ''well'' worth the effort, however, as the mere act of summoning it cannot be negated, and once it's summoned, ''you win.''
** There is also the Arcana Force monsters. They're effects rely solely on getting the right flips with a coin, but there are cards that can help a player choose what effect applies. So if a person is smart and uses the cards correctly, they can get monsters that half damage taken, summon tokens once a turn, or even skip the opponents turn entirely and deal massive damage.
** [[http://yugioh.wikia.com/wiki/Sephylon%2C_the_Ultimate_Timelord Sephylon, the Ultimate Time Lord]], the BigBad boss monster of YuGiOh5Ds, has an impressive 4000 ATK/DEF and can be easily Special Summoned once its condition is met, but it requires 10 monsters in the Graveyard to summon and only from the hand. This can be accomplished through self-milling tactics (e.g. Lightsworns), but it is still a dead draw early-game. Its effect to summon a Level 8 or higher Fairy monster as a 4000 ATK beatstick also requires a deck built around exploiting this effect due to the limited pool to choose from, not to mention this leaves the player even more vulnerable to dead draws. Nonetheless, if you can pull this off and remove your opponent's traps, it makes a fantastic late-game finisher that can end the game in a single turn. Plus, you're summoning {{God}}[[hottip:*:as in the Abrahamic God]].
** Most players shy away from Ritual Monsters because they require at least three cards to summon[[hottip:*:and in your hand unless you're using Djinns or Advanced Ritual Art]] and thus require a deck dedicated to searching them out. Nonetheless, getting them out gives access to the most powerful effects in the game. Some of the most notorious are [[http://yugioh.wikia.com/wiki/Demise,_King_of_Armageddon Demise, King of Armageddon]], whose field clearing effect plays host to many one-turn kills, [[http://yugioh.wikia.com/wiki/Herald_of_Perfection Herald of Perfection]], which played right, prevents the opponent from doing anything, the Gishki archetype, which eases the difficulty of getting out beatsticks with hand and field control effects, and of course Pegasus's [[http://yugioh.wikia.com/wiki/Relinquished Relinquished]], which steals opponent's boss monsters to use against them[[hottip:*:and is arguably the easiest Ritual to get out since it is only 1 star]].
* DinosaursAreDragons: Averted. The two have been completely separate categories since the very beginning. Though both focus upon having supremely nasty powerhouses, Dinosaurs tend more towards brute force while Dragons often have devastating effects to go with their physical power.
** Played straight with a new Archetype collectively called '''Evol'''''(ve)'': [[http://yugioh.wikia.com/wiki/Evoltile Reptiles]] turn into [[http://yugioh.wikia.com/wiki/Evolsaur Dinosaurs]] that Xyz into [[http://yugioh.wikia.com/wiki/Evolzar Dragons]].
* DisabilitySuperpower: Infernities are a variation of this trope: Typically not having cards in your hand would be considered a bad thing, as it would require you to constantly draw the cards you need from the top of your deck with no backup plan, but Infernities benefit from this situation.
* DiscardAndDraw: Many cards use discarding as part of a cost for an effect (e.g. [[http://yugioh.wikia.com/wiki/Magic_Jammer Magic Jammer]], [[http://yugioh.wikia.com/wiki/Lightning_Vortex Lightning Vortex]], [[http://yugioh.wikia.com/wiki/Hand_Destruction Hand Destruction]], etc.) or the effect itself (ex.[[http://yugioh.wikia.com/wiki/Graceful_Charity Graceful Charity]], [[http://yugioh.wikia.com/wiki/Dark_World_Dealings Dark World Dealings]], etc.)
** Note that certain cards such as Graceful Charity and Dark World Dealings allow the player to draw cards prior or after discarding as an effect.
* DownerEnding: The [[http://yugioh.wikia.com/wiki/Card_Trivia:Gagagigo Gigobyte story]] was originally this. Averted when Gagagigo the Risen was released as an XYZ Monster. However, since it's not a normal monster like the rest of the cards, it isn't immediately obvious that he continued the story.
* DragonHoard: [[http://yugioh.wikia.com/wiki/Dragon_Treasure Dragon Treasure]] buffs dragons.
* DropTheHammer [[http://yugioh.wikia.com/wiki/Hammer_Shot on the Goblin Attack Force.]]
* EarlyInstallmentWeirdness: Early sets put much more emphasis on normal monsters, with the only real strategy being how to get yourself the best ATK stat to overpower your opponent. Nowadays you'll hardly ever see any normal monsters in a deck unless it's built specifically around them.
** There have been a few changes in the phrasing of certain rules and cards: for example, [[http://yugioh.wikia.com/wiki/Polymerization Polymerization]] didn't actually explain what the card did in its original printing, since that was in the rulebook. After there started to be more ways to get out fusion monsters than just Polymerization, the explanation of the card was taken out and put on the card itself.
* EdibleThemeNaming: The [[http://yugioh.wikia.com/wiki/Madolche Madolche]]'s names are puns of French and Italian Desserts.
* EldritchAbomination:
** [[http://yugioh.wikia.com/wiki/Worm_Zero Worm Zero]].
*** Taken UpToEleven with its evilswarm counterpart [[http://yugioh.wikia.com/wiki/Evilswarm_Azathoth Evilswarm Azathoth]]
** [[http://yugioh.wikia.com/wiki/Treacherous_Gofer Treacherous Gofer]], who is also a ShoutOut to a [[{{Gradius}} certain shooting game]].
** [[http://yugioh.wikia.com/wiki/Cosmic_Horror_Gangi%27el Cosmic Horror Gangi'el]]
* ElementalPowers: The idea behind monster Attributes, and the specialty of the [[http://yugioh.wikia.com/wiki/Charmers Charmer]] archetype.
** BlowYouAway: Wynn
** CastingAShadow: Dharc
** DishingOutDirt: Aussa
** LightEmUp: Lyna
** MakingASplash: Eria
** PlayingWithFire: Hiita
** Also, as the name itself implies, the "Elemental HERO" Archetype, down to the point of every basic Elemental HERO being able to fuse with practically any other, except Neos, which has its own flock of Aliens to fuse with.
* EndOfTheWorldAsWeKnowIt: [[http://yugioh.wikia.com/wiki/End_of_the_World A Ritual Spell.]]
** Also caused in the Duel Terminal verse by [[http://yugioh.wikia.com/wiki/Trishula,_Dragon_of_the_Ice_Barrier Trishula, Dragon of the Ice Barrier]], which plunged the world into an ice age upon release. And now, [[http://yugioh.wikia.com/wiki/Verz_Ouroboros it's]] [[OhCrap back]].
** [[http://yugioh.wikia.com/wiki/Inferno_Tempest Inferno Tempest]] can only be activated when a player takes over 3000 damage from one attack. All monsters in the graveyards, and in both player's decks are [[DeaderThanDead removed from play.]] The world doesn't get much more thoroughly ended than having everyone who is currently or has previously lived in it disappear from reality.
* EquippableAlly: The Dragon-Type Dragunities are both this. As well as {{Attack Animal}}s.
** Union-type monsters, which can either stand alone as a monster (although they are typically weak) or can be equipped to another monster to give them an additional effect.
* EverythingsBetterWithPenguins: The [[http://yugioh.wikia.com/wiki/Penguin Penguin]] archetype.
** Two of the most well-known bounce cards are [[http://yugioh.wikia.com/wiki/Nightmare_Penguin Nightmare Penguin]] and [[http://yugioh.wikia.com/wiki/Penguin_Soldier Penguin Soldier.]]
* EverythingsDeaderWithZombies
* EvilTwin: The [[http://yugioh.wikia.com/wiki/Dark_counterparts Dark Counterparts]] archetype. They have few to no connections to each other, though DARK is probably the most-supported attribute in the game.
** The [[http://yugioh.wikia.com/wiki/Malefic Malefic]] monsters.
* EvilVersusEvil: There is a war between Dark Ruler Ha Des and Dark King of the Abyss. Ha Des tricked Dark King out of his throne with Demotion. Dark King got his revenge, but was killed by the Revived Ruler Ha Des.
* EvilWeapon: WordOfGod says the Equip Spell [[http://yugioh.wikia.com/wiki/Wicked-Breaking_Flamberge_-_Baou Wicked-Breaking Flamberge - Baou]] holds the dark power of [[http://yugioh.wikia.com/wiki/Guardian_Baou Baou]], its Guardian spirit. When [[http://yugioh.wikia.com/wiki/Warrior_Dai_Grepher Warrior Dai Grepher]] later wields it, he is overcome by the dark energy. He becomes [[http://yugioh.wikia.com/wiki/Sakuretsu_Armor a rampaging monster]], [[http://yugioh.wikia.com/wiki/Dark_Lucius_LV4 transforming more]] [[http://yugioh.wikia.com/wiki/Dark_Lucius_LV6 and more]] until, at the height of his mutation, [[http://yugioh.wikia.com/wiki/Dark_Lucius_LV8 he was completely unrecognizable as his former self]].
* EvolutionaryLevels: Pretty much any monster with LV in its name. Their main schtick is weak cards replacing themselves with stronger and stronger versions of themselves.
** The Evol archetype that will be released in Photon Shockwave sort of fits this too. "Sort of" in that while the younger versions special summon older ones, the younger ones don't need to be offered up in order to do so.
* ExactlyWhatItSaysOnTheTin: [[http://yugioh.wikia.com/wiki/Infinite_Cards Infinite Cards]], [[http://yugioh.wikia.com/wiki/Effect_Veiler Effect Veiler]], and [[http://yugioh.wikia.com/wiki/Negate_Attack Negate Attack]].
* ExactTimeToFailure: Once you activate the "Final Countdown" card, your opponent has exactly 10 of their turns to beat you or you win.
* ExactWords: See LoopholeAbuse further down the page for the many ways those trope can be abused.
** An interesting side-effect of Equip Spell Cards that give Piercing, is that you can inflict damage to your opponent by equipping them to your opponent's monster(s). Then, when your opponent attacks one of your Defense Position monsters with an ATK greater than your monsters DEF, he/she will take the difference. After all, even though it's '''your''' opponent's monster, it's your Spell Card, and thus it's your opponent — not ''you'' — who takes the extra damage, due to the wording on the cards.
** Some continuous card effects have linkage to another monster cards such as [[http://yugioh.wikia.com/wiki/Future_Fusion Future Fusion]] and [[http://yugioh.wikia.com/wiki/Call_of_the_Haunted Call of the Haunted]]. However, when the monster is removed from field other than being destroyed, the continuous effect card remains on the field meaninglessly.
*** When [[http://yugioh.wikia.com/wiki/Premature_Burial this card]] is '''destroyed''', destroy the equipped monster. "That card" is the primary offender.
** Many cards require, as a cost, that a player "sends a card to the graveyard" usually from their hand or deck. An interesting side effect of a card called Macro Cosmos that states that cards are removed from play instead of sent to the graveyard, is that cards that specify this can't be used, even if their effect is unrelated to the graveyard. This leads to interesting loopholes.
** Does a card say that under certain conditions you ''can'' do something? Because that determines if the effect is mandatory or not, which means everything when it comes to chaining cards. Say you chain Magic Jammer to an opponent's Spell and pay the discard cost. If the discarded card has an effect that says you ''can'' do something when it's discarded, you miss the timing because it occurs in the middle of resolving a chain. If it ''doesn't'' say can, then the effect is mandatory and once the chain is done resolving you ''do'' get the effect. And as for cards that say "destroy 1 card on the field", if that "can" isn't there then it ''has'' to be done, even if you have to target something you don't want to destroy, and in some cases you may have to destroy one of your own cards.
** You say your card has an effect that triggers when discarded? Does it say it has to specifically be from the deck or hand? Does it specify it has to be discarded ''to the graveyard''? Does it say it has to be discarded due to an opponent's card effect? Does it matter if it's discarded for a cost or by an effect? And as noted above, does it say you ''can'' do something when it gets discarded, because that will determine if the effect is mandatory or not when it gets discarded. This is the main reason Dandylion is Limited, because it gets its effect when it hits the Graveyard no matter how it gets sent there, and the effect is mandatory so you're promised your two tokens no matter what happens.
** XYZ cards have also caused players to take a closer look at cards like Sangan that specify "sent from ''the field'' to the Graveyard", because current rulings are that XYZ Material monsters don't count as being on the field, so Sangan wouldn't get its effect when detached from an XYZ monster.
* ExplosiveOverclocking: The theme of the cards [[http://yugioh.wikia.com/wiki/Overworked Overworked]] and [[http://yugioh.wikia.com/wiki/Limiter_Removal Limiter Removal]].
* EyesDoNotBelongThere: [[http://yugioh.wikia.com/wiki/Big_Eye Big Eye]], [[http://yugioh.wikia.com/wiki/Thousand-Eyes_Restrict Thousand Eyes Restrict]], and [[http://yugioh.wikia.com/wiki/Hundred-Eyes_Dragon Hundred-Eyes Dragon]]
* FallenAngel: The [[http://yugioh.wikia.com/wiki/Darklords Darklords]] and [[http://yugioh.wikia.com/wiki/Marie_the_Fallen_One Marie the Fallen One]].
* FamilyFriendlyFirearms - Many cards with realistic guns in the art had them replaced with lasers, fanciful guns, or knives, with varying success.
** Great example of a card that explicitly has a [[http://yugioh.wikia.com/wiki/File:BarrelBehindtheDoor-EE1-JP-R.jpg gun]] on it to [[http://images.wikia.com/yugioh/images/8/8a/BarrelBehindtheDoorDR1-EN-R-UE.jpg less obvious]]. Plus the gun in the original was a burgler's.
* FanService - Averted. Cards which seem to gear towards this are edited for the TCG.
* FantasyKitchenSink
* FeatheredFiend: A number of monsters, but the [[http://yugioh.wikia.com/wiki/Blackwings Blackwings]] stand out.
* FlamingSword: Wielded by [[http://yugioh.wikia.com/wiki/Flame_Swordsman Flame Swordsman]]. Also, the Spell Card [[http://yugioh.wikia.com/wiki/Salamandra Salamandra]].
* FragileSpeedster: Some decks focus on getting out monsters as quick as possible, [[ZergRush swarming the field]] (like the Harpies, the Blackwings, Frogs, and so on). To balance this out, most of them do not have very high attack power.
** Xyz monsters are much easier to summon than Synchro monsters or Fusion monsters, but a lot of them don't have terribly high attack points comparatively, and most of them can only use their effect once or twice because they need to detach the monsters used to summon them. If they are revived from the graveyard they can't use their effect at all! Most of them are meant for quick-and-dirty support rather than something to decisively end the opponent.
* FrogsAndToads: [[http://yugioh.wikia.com/wiki/Frog These fellas.]] The Frog archetype is usually WeakButSkilled; they are mostly-all low-level monsters with sub-par attack, but have ''devastating'' support effects, like "Des Croaking" which blows away all cards controlled by the opponent.
* FusionDance: Fusion was a gameplay feature since the early days of the game, but the Elemental [=HEROs=] are entirely based around fusing with one another. There are dozens of potential combinations present. To a lesser extent, the newer Gemknight archetype is also based around fusion.
* GameplayAndStorySegregation: Many cards have slightly different effects between the anime and the physical card game; what would be a game-breaker might be Nerfed when it becomes real, or vice-versa. Sometimes the rules are a little different as well; summoning monsters in face-down defense position hasn't happened in the anime since the first season, but it's still an important part of the rules of the real game.
** As for a more direct example, Normal monsters. Take [[http://yugioh.wikia.com/wiki/Maiden_of_the_Moonlight Maiden of the Moonlight]] for example. ''Powers beyond mortal comprehension'', huh? That 1500 ATK certainly says otherwise! Sure there are SOME examples where it fits, like the famous Blue-Eyes White Dragon (in terms of ATK, there are not many monsters that can stand up to it), but its just ridiculous for the most part. In fact, this is what made Shapesnatch a MemeticBadass.
* GangOfCritters: Seen [[http://yugioh.wikia.com/wiki/The_Law_of_the_Normal here]] and [[http://yugioh.wikia.com/wiki/The_Big_March_of_Animals here]].
* GladiatorGames: [[http://yugioh.wikia.com/wiki/Gladiator_Beast Gladiator Beasts]], a set of monsters that are ExactlyWhatItSaysOnTheTin, and has the gimmick of [[SwitchOutMove "tagging out"]] with each other after a battle. Bonus points for {{Konami}} [[ShownTheirWork showing their work]] by using the real gladiator types and weapons/battle tactics for most of the cards, as well as real-life Roman figures for the namesakes of the most powerful Beasts. .
* GlassCannon: The Lightsworns were designed as this with a combo of FragileSpeedster. Most of their monsters are quite powerful and a good Lightsworn deck will probably win very quickly...or not win at all. This is because almost all of them send cards straight from your deck to the graveyard at the end of the turn, meaning your deck will burn itself out after a while.
** There's also quite a few monsters that have high attack points but pathetic defense points. The mighty Rainbow Dragon has 4000 ATK and 0 DEF, for example. Similarly, the Inverz/Steelswarm monsters all have 0 DEF. If a clever player runs cards that can switch attack and defense positions or stats, or outright nuke said low-defense monsters, these monsters are toast.
* GodSaveUsFromTheQueen: Ruin, Queen Of Oblivion and the [[http://yugioh.wikia.com/wiki/Allure_Queens Allure Queens]].
** [[http://yugioh.wikia.com/wiki/Queen_of_Thorns Queen of Thorns]] if you run anything other than Plant-type.
* GottaCatchEmAll: This is impossible in real life (unless you're insanely rich and have a lot of spare time on your hands, and even then [[http://yugioh.wikia.com/wiki/Tyler_the_Great_Warrior Tyler the Great Warrior]] is truly one-of-a-kind), but it's ''quite'' possible if you're playing any of the various Yu-Gi-Oh video games that are released every year.
* GratuitousEnglish: At this point, the OCG probably has more cards and booster packs with English than Japanese names. A good deal of Japanese cards also have English names.
* GratuitousJapanese: In the first few booster packs, UDE's policy was that [[KeepItForeign cards with English names would have their names translated into Japanese]]. They've since stopped, but some card names are left untranslated.
* HarpingOnAboutHarpies: The Harpie Lady monsters.
* HealingShiv: [[http://yugioh.wikia.com/wiki/Monster_Reborn Monster Reborn's]] international artwork depicts a dagger that [[ExactlyWhatItSaysOnTheTin resurrects monsters]]. [[note]] The Japanese version shows a simple ''ankh''. [[/note]]
* {{Hermaphrodite}}: [[http://yugioh.wikia.com/wiki/Yubel Yubel]]
* HolyHandGrenade: Remember Horakhty, the Egyptian god that won the day against Zorc in the original anime and manga? [[http://yugioh.wikia.com/wiki/The_Creator_God_of_Light,_Horakhty She's a card now]], and her effect is like this. Good luck Summoning her, though...
* HouseRules: Two common variations are based on the Forbidden/Limited list: Traditional, which allows banned cards (up to one of each), and Mega-Banned, which completely disallows cards that are on the list at all. Another type sometimes seen in competitive play is the Sealed Deck duel, which gives both players identical decks, but no one knows the contents.
* HumongousMecha: Many of the Machine-type monsters, especially some of their Fusions.
* {{Hypocrite}}: The players of this game can be this sometimes. Such as accusing other players of playing net-decked, overpowered, autopilot decks when they themselves run a deck with arguably the same traits.
* AnIcePerson: The "Ice Barrier" archetype and related cards.
** Also, [[http://yugioh.wikia.com/wiki/Elemental_HERO_Absolute_Zero Elemental HERO Absolute Zero]]
* InstantWinCondition: Several, listed on the UsefulNotes page.
* InTheEndYouAreOnYourOwn: Regardless of what the TV series have you believe, friends don't mean much in a standard 1-on-1 game.
* InvulnerableKnuckles: An important gameplay ''aversion.'' To explain: If your monster attacks an opponent's defense-position monster, and the defender has more DEF than the attacker has ATK, it's the attacker who takes damage; think of it like punching a brick wall with your fist. This is one of the reasons why monsters can be summoned in face-down defensive position; the attacker doesn't know what he's in for. Some decks can be built around this, with defensive monsters that flip themselves back down and "Shifting Sands" in play that lets you randomize the positions of your face-down monsters.
* JokeCharacter:
** The Toons. Portrayed as a wacky subset of monsters in the game [[AwesomeButImpractical that can attack Life Points directly, but usually have to wait a turn to do so, which hampers their playability a lot.]]
** A lot of cards are not only useless, but they seem to have been made for nothing more than novelty. For example, there's Sanwitch, a Level 6 Fusion Monster with 2100 ATK. There's no reason to ever use it, and even if you wanted to, you can't -- Witch of the Black Forest has been banned from play ever since the Banned List was created, and Sangan has been on and off it and was on it when Sanwitch was made.
** Later on, the flavor text of Normal Monsters borders on AffectionateParody. Here's [[http://images3.wikia.nocookie.net/__cb20120720032851/yugioh/images/6/6e/Rabidragon-PHSW-EN-C-1E.png Rabidragon]], [[http://images.wikia.com/yugioh/images/1/16/Wattaildragon-GAOV-EN-C-1E.png Wattaildragon]], and [[http://images1.wikia.nocookie.net/__cb20120623102418/yugioh/images/f/fb/AlligatorsSword-TU08-EN-R-UE.png Alligator's Sword]]. Such things made [[http://images1.wikia.nocookie.net/__cb20061226053609/yugioh/images/thumb/4/4c/Shapesnatch-PGD-NA-C-1E.jpg/300px-Shapesnatch-PGD-NA-C-1E.jpg Shapesnatch]] a MemeticBadass for its "terrible power" (and as a Level 5 1200/1700 monster, yes, it's very terrible).
* KamenRider: The [[http://yugioh.wikia.com/wiki/Masked_Heroes Masked HEROes]].
* KeepCirculatingTheTapes: There are some cards that just can't be bought normally, first hand as in the way they were meant to be; the most famous example is the first edition of the 3 Egyptian God Cards: foiled, shiny and ColourCodedForYourConvenience, these were packed with the {{GBA}} game ''Yu-Gi-Oh! Reshef Of Destruction''; people went crazy for this game ''just to get the cards'', a great deal of the copies sold for this game was due fans wanting the cards, eventually retailers came to know that some people just bought the game for these cards, so they would gladly put a reminder for used copies '''Does Not Contain The Limited Edition Cards!''', people on EBay followed suit as gullible fans also thought that buying a $20 copy of the game would grant them shiny and exclusive cards that were sold for about $100 separately.
* KillEmAll: Some cards are able to wipe out everything on both sides of the playing field (or just all cards on the opposing side). A couple of cards take it even further by also wiping out every card in the players' hands!
* KillItWithFire: Is the strategy with a lot of Fire/fire-themed cards, such as [[http://yugioh.wikia.com/wiki/Elemental_HERO_Flame_Wingman Elemental HERO Flame Wingman]], [[http://yugioh.wikia.com/wiki/Volcanic_Doomfire Volcanic Doomfire]], [[http://yugioh.wikia.com/wiki/Achacha_Archer Achacha Archer]], and [[http://yugioh.wikia.com/wiki/Backfire Backfire.]]
* KillSat: [[http://yugioh.wikia.com/wiki/Satellite_Cannon Satellite Cannon]]
* KnightTemplar: Vylons are so focused on creating a world of PerfectPacifistPeople that they are willing to make a WorldOfSilence to accomplish it. [[LogicalFallacies By killing everyone, apparently.]]
* KrakenAndLeviathan:
** [[http://yugioh.wikia.com/wiki/Levia-Dragon_-_Daedalus Levia-Dragon - Daedalus]] and its evolved form [[http://yugioh.wikia.com/wiki/Ocean_Dragon_Lord_-_Neo-Daedalus Ocean Dragon Lord - Neo-Daedalus]]
** [[http://yugioh.wikia.com/wiki/Evigishki_Gustkrake Evigishiki Gustkrake]]
* TheLastOfHisKind: [[http://yugioh.wikia.com/wiki/The_Last_Warrior_from_Another_Planet The Last Warrior from Another Planet]]
* LeeroyJenkins: Some cards have compulsory attack effects (i. e. Berserk Gorilla, Battle Mania).
* LeetSpeak: There's a card called Mind Haxorz. Seriously.
* [[LethalJokeItem Lethal Joke Card]]: There's a bunch of these. The Ojamas, three exceedingly weak monsters with no attack points, got a number of support cards that let them drastically turn the table on the enemy. "Gift Card" increases your opponent's life by 3000, but if you combo that with "Bad Reaction To Simochi", or have "Nurse Reficule The Fallen One" on the field, which turns healing into damage, you've just dealt a ''serious'' blow to the opponent. "Skull Servant" was famous for being an extremely weak card (in fact, most video games give you credit if you can win a game with the Skull Servant) but can act as fuel for "King of the Skull Servants," who becomes increasingly more powerful the more Skull Servants are in the Graveyard.
** Grinder Golem and Inferno Tempest. Grinder Golem summons a 3000 attack point monster on your opponents side of the field and gives you two tokens with 0 attack points. Now attack the Golem with one of your tokens, take 3000 damage, and activate Inferno Tempest. It removes every monster in both players decks and graveyards from play. You may even be able to perform an OTK by activating D.D. Dynamite which does 300 damage for every card of your opponents that is removed from play.
*** Grinder Golem has the bonus of having low defense points, so you can summon it to the opponent's field in defense position, then use it as fodder for a monster that needs to destroy a monster by battle to activate an effect, while also providing tokens for other effects.
** Foolish Burial sends a monster straight from your deck to the graveyard, which would seem like a bad idea on its own, except if you combine that with anything that lets you revive a monster, you've just hand-picked a monster from your deck to be summoned onto the field. There's a reason this card is limited to one per deck.
*** Foolish Burial also sets off Dandylion, which summons two Level 1 tokens when sent to the grave. This is especially useful when Synchro summoning. If you summon Debris Dragon after doing this and use it to revive Dandylion, you can now Synchro Summon any Dragon-type synchro monster between level 5 and 9, and then gain another two Level 1 tokens. All this from two cards.
**** Using the above strategy and a Level 1 Tuner, you can summon Formula Synchron and Stardust Dragon, and then Shooting Star Dragon, which has 3300 ATK and a myriad of powerful effects. If you use Glow-up Bulb as the Level 1 Tuner, it can revive itself and you can play a second level 2 synchro monster, allowing you to play Shooting Quasar Dragon. So basically you just played a 4000 ATK monster with three cards, and drew an extra one thanks to Formula Synchron. All 4 of the setup cards, Foolish Burial, Dandylion, Formula Synchron, and Debris Dragon, have since been limited.
* LightIsGood: Most monsters of the LIGHT attribute seem to be heroic, but...
** LightIsNotGood: seems to be the theme of the Arcana Force monsters and most of the [[http://yugioh.wikia.com/wiki/Worm Worm]] Archetype.
** The Vylons are an interesting example. In the story they teamed up with the Lavals, Gishki, Gusto, and Gem-Knights in order to beat back the Steelswarms. This ultimately leads to [[http://yugioh.wikia.com/wiki/Vylon_Disigma Vylon Disigma]] defeating them. But as it turns out, those sets were only working together to beat the Steelswarms and prior to that were also fighting each other. The Vylons wish for a perfect existence for everyone, but they now see that's impossible. So they've decided to use Disigma to kill em all.
* LimitedSpecialCollectorsUltimateEdition: Quite ''many'' cards are this, which kind of diminishes its value a bit; but there some among these that really are worthy of its title, examples are cards that are actually sold separately in one big deluxe package: ''Shinato of A Higher Plane'' was this at first. Other examples are Special Summons hyped in the AnimatedAdaptation and TheMovie, expect to only get them in special events or packed with another product of the franchise (usually a VideoGame).
* LoadsAndLoadsOfCharacters
* LoopholeAbuse: Many older cards are worded in such a way to allow this as the game and its strategies have progressed and evolved in ways the card game back then couldn't have foreseen. For example, Mind Control lets you take control of an opponent's monster, but it can't attack or be Tributed. When it was first released it didn't have a lot of uses, mostly just Fusion (which was rarely used) and getting a monster out of the way. Then came Synchros and Xyz, which state their summoning methods don't actually count as Tributing...and so it was Mind Control is now Limited.
** Similar to Mind Control, Instant Fusion - pay 1000 Life Points to special summon a Level 5 or lower Fusion monster from the extra deck, but it can't attack and is destroyed during at the end of the turn. Unless you need Tribute fodder, entirely useless, since none of the Level 5 or below Fusions are any good even if they weren't only around for one turn. Then Synchros came, and this card, combined with a Tuner, let you summon pretty much any Synchro monster you wanted. And then came the [=XYZ=] cards, which can do just about the same thing.
** Two old school revival cards have this. Premature Burial states that when it is destroyed, the monster it revived is destroyed. Its effect says nothing about the monster dying if the card is just removed from the field, most famously by returning it to the hand to be played again. Call of the Haunted meanwhile says that when the monster it summoned is destroyed the card itself also goes, but as with Premature Burial it doesn't go if the monster is removed from the field, leaving Call of the Haunted face-up and useless, unless you have something like Scrap Dragon. Be sure to pay attention to if a card specifically says ''removed from the field'' or ''destroyed'', it makes a huge difference.
** The Wind-Ups. Each of them have effects that can only be activated once while on the field. But if it's sent to the grave/banished zone, then you can re-use the effects. This led to the infamous "Wind-Up Loop" in the March 2012 format, where unless your opponent had Effect Veiler or Maxx C, you basically made them discard their entire hand without any drawback to yourself.
** Tour Guide From the Underworld summons a second monster when she comes into play, with lots of limitations on what you can do with it. But, of course, it doesn't forbid you from using the monster with mechanics that were added to the game ''later'', like XYZ summons...
** There's also numerous cards that cause things to happen at certain times during the turn. This makes some cards like Solomon's Lawbook (skip your next Standby Phase), and Dimensionhole and Interdimensional Matter Transporter (banish a monster until a particular turn phase) {{Crouching Moron Hidden Badass}}es because they allow you to avoid various effects by "dodging" turn phases. For the latter, there's spirit Monsters, which specify they return to your head at the end of the turn they're Normal Summoned or flipped face-up, so if you banish them from the field and they return later, they get to stay on the field because the End Phase of the turn you played them has passed and they don't return on subsequent turns.
* LuckBasedMission: No matter how you build it, running an Arcana Force deck inevitably turns into this.
** Also, Lightsworns. Lightsworn cards send cards from the top of the Deck to the Graveyard, and abuse this with plenty of monsters whose effects activate in Graveyard. Of course, many key cards, including the GameBreaker Judgment Dragon need to be in the hand to use. Running Lightsworns is just hoping you get the right cards in your Graveyard and the rest in your hand. Just as Arcana Force, you can try to build them to get around this, but most of the time it's better not to.
* LuckilyMyShieldWillProtectMe: [[http://yugioh.wikia.com/wiki/Millennium_Shield Millennium Shield]]. Big Shield Gardna too, considering his pose.
* LuckManipulationMechanic: [[http://yugioh.wikia.com/wiki/Second_Coin_Toss Second Coin Toss]], and [[http://yugioh.wikia.com/wiki/Dice_Re-Roll Dice Re-Roll]].
* {{Lunacy}}: [[http://yugioh.wikia.com/wiki/Mystical_Moon Mystical Moon]]. It powers up Beast-Warrior-type monsters.
* MadeOfExplodium: Scrap monsters are always either being destroyed by their own effects or the effects of their support cards. Fortunately, their secondary effects usually kick in after this, allowing you to recycle other Scrap cards.
* MadScientist: [[http://yugioh.wikia.com/wiki/Kozaky Kozaky]] and the [[http://yugioh.wikia.com/wiki/Magical_Scientist Magical Scientist]]. Some card artworks suggest that these two are actually best buds.
* MagicalLand: Well, it's only advertised as a [[http://yugioh.wikia.com/wiki/Magical_Citadel_of_Endymion citadel]], but if you look, it houses an entire little kingdom/village inside the magical barrier.
** Arguably, the entire monster world would count, as it's the home of all sorts of fantastic creatures.
** [[http://yugioh.wikia.com/wiki/Secret_Village_of_the_Spellcasters Secret Village Of The Spellcasters]].
* MagicKnight: [[http://yugioh.wikia.com/wiki/Breaker_the_Magical_Warrior Breaker the Magical Warrior]], ''[[http://yugioh.wikia.com/wiki/Dark_Magician_Knight Dark Magician Knight]]'' and the ''[[http://yugioh.wikia.com/wiki/Dark_Paladin Dark Paladin]].
* MagicMirror: [[http://yugioh.wikia.com/wiki/Fiends_Mirror Fiend's Mirror]]
** [[http://yugioh.wikia.com/wiki/Copycat Copycat]]
** [[http://yugioh.wikia.com/wiki/Dragons_Mirror Dragon's Mirror]]
* MagikarpPower: A lot of the LV monsters are weak in their initial forms but replace themselves with much, ''much'' stronger versions. One of the biggest Magikarps in the game is Winged Kuriboh, who, on its own, simply prevents you from taking damage for a turn. There's a card that can replace it with a "Winged Kuriboh Level 10", which makes every monster your opponent has on the field explode and damage them equal to the total ATK of the monsters destroyed, usually more than enough to finish them off and win the Duel.
** There are also cards that slowly build up power over time - they gather tokens, so many turns need to pass, etc - with strong effects that trigger once they're charged up.
** As a meta example, a lot of old weak archetypes (Gravekeepers, Batterymen, Frogs) will often receive new support cards in sets released years later that suddenly make them much more viable.
** The Ojama own this trope. As if Ojama Delta Hurricane!, which obliterates your opponent's hand and field but requires the three Ojama brothers as an activation condition, weren't enough, the more recent additions to the family, Red and Blue, can mass-summon fellow Ojamas from the hand and tutor Ojama cards from the deck respectively. Last but not least, Ojama Country can summon Ojamas from the grave and flips the attack and defense of all monsters on the field. Run with Ojama King and other StoneWall monsters and...
* MagmaMan: [[http://yugioh.wikia.com/wiki/Lava_Golem Lava Golem]]
* ManEatingPlant: [[http://yugioh.wikia.com/wiki/Man-Eating_Plant Literally]], but note that it is considerably less frightening than your usual ManEatingPlant because it only has 800 attack points; on the other hand, we have [[http://yugioh.wikia.com/wiki/Gigaplant the Gigaplant]].
* MarriedToTheJob: Poor poor [[http://yugioh.wikia.com/wiki/Kozaky Kozaky]]...
* MaskOfPower: Not too many, but enough to count as [[http://yugioh.wikia.com/wiki/Masks an archetype]].
* [[MatryoshkaObject Matryoshka Card]]: Tomato Matryoshka allows you to summon another Tomato Matryoshka from your hand or deck when it's Normal Summoned.
* MeaningfulName: Earthbound Immortals. Yeah, they're really '''Earth'''bound (as in bound to the ''Field'' Spell!).
** Several monsters with the piercing ability have names with stabbing and/or cutting tools in them, such as [[http://yugioh.wikia.com/wiki/Blackwing_-_Bora_the_Spear Blackwing-Bora the Spear,]] [[http://yugioh.wikia.com/wiki/Elemental_HERO_Bladedge Elemental HERO Bladedge,]] [[http://yugioh.wikia.com/wiki/Gravekeeper%27s_Spear_Soldier Gravekeeper's Spear Soldier,]] and [[http://yugioh.wikia.com/wiki/Mad_Sword_Beast Mad Sword Beast.]]
* MechanicalEvolution: Machine King. Its youngest form is labeled as being from the year ''3000 BC!'' Interestingly, the chronologically earlier forms seem to have been created as an afterthought.
* MechanicalMonster: Many machines resemble living creatures, like the Cyber Dragon line. On the flip side of things are the Scrap monsters, which clearly ''look'' mechanical but technically count as just about everything except machines--insects, beasts, dragons and so on.
* MemeticHandGesture: Some players have adopted the practice from [[Anime/YuGiOh the anime]] of placing their hands over their decks to signify surrendering the duel, though it's obviously not sufficient to just do this for it to legitimately count as a surrender.
* {{Metagame}}: Try to run a deck ''without'' cards like ''Heavy Storm'', ''Lightning Vortex'', or defensive traps such as ''Scrap-Iron Scarecrow'' and ''Mirror Force'' and count the time until someone says you ''can't'' run a deck without them.
** The Forbidden/Limited lists that change every 6 months tend to both reflect and change the Metagame.
* {{Metaplot}}: There was an attempt to have one for a while, based on the artwork of the [[http://yugioh.wikia.com/wiki/Gagagigo_(series) Gagagigo]], [[http://yugioh.wikia.com/wiki/Inpachi Inpachi]], Goblin cards, [[http://yugioh.wikia.com/wiki/Card_Trivia:Royal_Writ_of_Taxation Royal]] [[http://yugioh.wikia.com/wiki/Royal_Cards Cards]], [[http://yugioh.wikia.com/wiki/Different_Dimension Different]] [[http://yugioh.wikia.com/wiki/Card_Trivia:Warrior_Lady_of_the_Wasteland Dimension]] cards, as well as various monsters appearing in the art of other cards. The lack of flavor text on most cards meant that any story that might have been present was completely lost. More recent cards still reference each other in the artwork, but there doesn't seem to be any attempt to build a coherent plot. A fair chunk of {{fanfic}} is devoted to spinning a coherent story out of the various references.
** The new Duel Terminal arcade game's card archetypes seem to have this going for them, as evidenced by a few cards both within [[http://yugioh.wikia.com/wiki/Ally_Mind the]] [[http://yugioh.wikia.com/wiki/Ally_of_Justice_Clausolas Duel]] [[http://yugioh.wikia.com/wiki/Mist_Valley_Thunder_Lord Terminal]] and [[http://yugioh.wikia.com/wiki/Battle_of_the_Elements outside]] [[http://yugioh.wikia.com/wiki/Worm_Call it]]. [[note]]That stuff Mist Valley Thunder Lord is holding? They're the broken pieces of a [[http://yugioh.wikia.com/wiki/Ally_of_Justice_Catastor Catastor]].[[/note]]
* [[MeteorOfDoom Meteor Of]] [[strike:Doom]] [[http://yugioh.wikia.com/wiki/Meteor_of_Destruction Destruction]]
* MightyGlacier: Some decks require a lot of set-up before you can bring out the big offensive guns. One example is the Destiny [=HEROs=], who are almost all defensive monsters that help the player increase their hand and field presence. This is because their two trump card monsters, Plasma and Dogma, require three Tributes to summon (but are so powerful they can really hamstring the opponent once finally out).
* MindControl: One of the main features of the Aliens is infecting opposing cards with A-counters (called "A-cells" in lore) which they can then take control of. Mind control effects are often limited in some way, so if you can avoid destroying your stolen monsters, [[IKnowYoureInThereSomewhereFight they might come back to you]].
** There is also [[http://yugioh.wikia.com/wiki/Mind_Control Mind Control]].
*** There was also once [[http://yugioh.wikia.com/wiki/Change_of_Heart Change of Heart]] and [[http://yugioh.wikia.com/wiki/Brain_Control Brain Control]], but they're now forbidden.
* MonsterClown: A literal example! Mystic Clown... Dream Clown... Crass Clown... Saggi The Dark Clown... as you might have guessed none of these guys are very pleasent. Luckily, most clown cards are fairly weak or have no effects. Most.
* MookMaker: Anything that generates Tokens regularly, like "Goka, the Pyre of Malice".
* MushroomMan: There are cards specifically named Mushroom Man #1 and #2.
* MutualKill: Both monsters are destroyed when they have the same ATK and attack each other.
* MyDeathIsJustTheBeginning: A number of the new Psychic types from Extreme Victory practically exist to be sent to the graveyard. (Namely [[http://yugioh.wikia.com/wiki/Serene_Psychic_Witch Serene Psychic Witch]], [[http://yugioh.wikia.com/wiki/Silent_Psychic_Wizard Silent Psychic Wizard]], and [[http://yugioh.wikia.com/wiki/Hushed_Psychic_Cleric Hushed Psychic Cleric]].) [[http://yugioh.wikia.com/wiki/Overmind_Archfiend Overmind Archfiend]] also has this going for it, although it's powerful in it's own right.
* NamesToRunAwayFromReallyFast: There's a list on the Trivia page.
* NamesTheSame: Removing a material from [[http://yugioh.wikia.com/wiki/Number_11:_Big_Eye Number 11- Big Eye]] doesn't let you [[http://yugioh.wikia.com/wiki/Big_Eye arrange the top 5 cards of your deck.]]
* NegateYourOwnSacrifice: The popular Stardust Dragon can sacrifice itself to prevent some other card on the field from being destroyed, but it can also bring itself back every turn it does this.
* {{Nerf}}ed: A really big Nerf occurred when Synchro monsters were introduced. The "Fusion Deck" became the "Extra Deck," and instead of having an unlimited number of Fusion monsters in it (barring the "no more than three with the same name" rule) players were now limited to 15 cards (Synchro or Fusion monsters). This is because Synchro monsters are generally unspecific as to how they can be summoned and it would be too game-breaking to allow an unlimited number of them in there, but this was a ''major'' blow to Elemental HERO decks, since there are way more than 15 different possible Elemental HERO fusion combinations.
** Since they can't re-write the rules as written on a card once it's been issued, sometimes Konami will limit how many of certain powerful cards you're allowed to have in your deck, sometimes just 2, 1, or none at all. These "limited/forbidden" lists change every six months as new cards are introduced that change the balance of the game.
* NeverSayDie: Any monster with the word "Death" in its name has it changed to "Des" as a deliberate transliteration, hence "Death Frog" is "Des Frog" (and "Death Koala" is "Des Koala").
* NewSeasonNewName: After [[Anime/YuGiOh5Ds 5D's]] cards began appearing in the game, "5D's" was added to the name of the game in the box logo and in some other places. The same for ''Anime/YuGiOhZEXAL''.
* NiceJobBreakingItHero: Quite a few cards can be used to Special Summon a more powerful monster upon the death of the first. For example, Rise of the Snake Deity can be used upon the death of Vennominon, the King of Snakes to summon Vennominaga, the Deity of Poisonous Snakes which gets 500 ATK for each Reptile in the graveyard, can't be the target of abilities, can come back from the dead with the sacrifice of a Reptile from the graveyard and causes an instant victory in 3 attacks.
** Yubel is probably the best example: If you attack it, then ''you'' take damage instead and Yubel itself survives. If you destroy it, then it becomes stronger. The only way to destroy it is... [[SheatheYourSword waiting]]: Yubel needs a sacrifice each turn to stay alive, and being destroyed this way won't bring up its stronger forms. Unless, of course, your opponent abuses the many reusable Tribute fodders in the game; then you're screwed.
** The [[http://yugioh.wikia.com/wiki/Meklord Meklord]] archetype is considered this if you are playing a synchro deck.
** Also, Berserk Dragon can only be summoned by a spell card that can only be used if one of your Level 8+ monsters is destroyed.
* NiceHat: [[http://images1.wikia.nocookie.net/__cb20070401121621/yugioh/images/b/bd/GreatPhantomThiefDR1-EN-C-UE.jpg Great Phantom Thief]] sports quite the piece.
** Also, [[http://yugioh.wikia.com/wiki/Cosmo_Queen Cosmo Queen]].
* {{Ninja}}: A whole lot of them, in fact. A trio of them even serve as a ShoutOut to Konami's popular video game series ''Ganbare Goemon''
** In Recent Packs, Ebisu has been added as "Masked Ninja Ebisu", which means you can now have the Main 4 characters from ''Ganbare Goemon''
* NoExportForYou: For many years, some of the earlier (and more requested) cards released in the OCG would take years before they finally appeared in the TCG. [[OvershadowedByAwesome The playability of some cards compared to others available in the same time period, however...]]
** The [[http://yugioh.wikia.com/wiki/Blue-Eyes_Shining_Dragon Blue-Eyes Shining Dragon]] was released as a promo for the movie in 2004. The card required to summon it, the [[http://yugioh.wikia.com/wiki/Blue-Eyes_Ultimate_Dragon Blue-Eyes Ultimate Dragon]], wasn't released until over a year-and-a-half later. Though both were available in Japanese, OCG cards are not allowed when playing the TCG.
** Recent TCG sets have included more cards than the corresponding OCG set- some of these are cards that were previously OCG only, while others are cards that are exclusive to the TCG. In turn, TCG only cards have recently begun to be released in the OCG through the Extra Pack sets. ''Eventually'' the two card pools may become equal...
** Sometimes this applies to the video games as well. ''Tag Force 6'', hotly anticipated by some as the first video game to feature Xyz cards, was not released outside of Japan.
* NonHumanUndead: Quite a few, including the recent variants of legacy cards (i. e. Summoned Skull -> Archfiend Zombie Skull, Red Eyes Black Dragon -> Red Eyes Zombie Dragon, etc.).
* NonIndicativeName: Some cards have them. For example, you wouldn't really think that a card called [[http://yugioh.wikia.com/wiki/Psychic_Overload Psychic Overload]] would be a good thing, but it can actually be extremely helpful.
* NothingIsScarier: [[http://yugioh.wikia.com/wiki/The_Thing_in_the_Crater The Thing in the Crater]] and [[http://yugioh.wikia.com/wiki/Dweller_in_the_Depths Dweller in the Depths]].
** [[http://yugioh.wikia.com/wiki/Shiny_Black_%22C%22 Shiny Black "C"]] and [[http://yugioh.wikia.com/wiki/Maxx_%22C%22 Maxx "C"]].
* NotQuiteDead: Numerous cards allow other cards to return from the Graveyard (either to the field or the player's hand), though not so much that DeathIsCheap. In fact most Zombie monsters have effects like this.
* NotTheIntendedUse: A number of instances. For example, Barrel Behind the Door was initially meant to bounce back damage done to you by effects. It works just as well bouncing non-cost damage from your cards to your opponent.
** One of the most interesting examples is [[http://yugioh.wikia.com/wiki/G.B._Hunter G.B. Hunter]]. As the name says, it was designed to defeat Gladiator Beasts, which return to the Deck to activate their effects. Turns out, she's great at preventing ''your'' monsters from returning to the Deck ''or'' Extra Deck. Monsters like, say, the [[http://yugioh.wikia.com/wiki/Majestic_Star_Dragon Majestic]] [[http://yugioh.wikia.com/wiki/Majestic_Red_Dragon Synchros]], any Elemental Hero Fusion Monster with Neos in its name, or, ironically, [[http://yugioh.wikia.com/wiki/Gladiator_Beast_Octavius Gladiator Beast Octavius]].
* NukeEm: Shown in the artwork of [[http://yugioh.wikia.com/wiki/Final_Destiny Final Destiny.]] Not to mention it is one of the very few cards that lets you wipe out the whole field.
* NumericalThemeNaming: The Karakuri archetype. In Japan, their names are actually numbers: "Karakuri Soldier Nisamu," for example, is written with the kanji 弐参六 (236). In the US, the dual nature of their names is retained by translating the kanji as both a ''model'' number and the actual reading thereof (or a variation); e.g. "Karakuri Soldier mdl 236 'Nisamu'".
* OneHitPointWonder: All except a dozen or so monsters only need one attack to be destroyed, regardless of how low or high the difference is.
** And a few of them have effects where they are destroyed after they are attacked, regardless of ATK or DEF points.
* {{Orochi}}: [[http://yugioh.wikia.com/wiki/Yamata_Dragon Yamata Dragon]] and [[http://yugioh.wikia.com/wiki/Evil_Dragon_Ananta Evil Dragon Anata]]
* OrphanedSeries: The physical card game is still ongoing, but the video game releases stopped short of the introduction of Xyz monsters and the Zexal series; this, after Konami released at least one or more Yugioh video games each year like clockwork.
* OurAngelsAreDifferent: In fact, some of them are [[http://yugioh.wikia.com/wiki/Synthetic_Angels Synthetic.]]
* OurDragonsAreDifferent: Mostly western dragons, though a few eastern dragons also appear. Some dragons stretch the definition of "dragon," like Black Rose Dragon, which appears to mostly be a giant rose with thorny vines and a dragon head.
* OurMonstersAreWeird: Oh, yeah...
* OurVampiresAreDifferent: [[http://yugioh.wikia.com/wiki/Vampire_Lord Vampire Lord]], [[http://yugioh.wikia.com/wiki/Vampire_Lady Lady]], [[http://yugioh.wikia.com/wiki/Vampire_Genesis Genesis]], [[http://yugioh.wikia.com/wiki/Vampire%27s_Curse Curse]], and, the most different of all, [[http://yugioh.wikia.com/wiki/Vampire_Koala Koala]].
* OxymoronicBeing- Behold the [[http://yugioh.wikia.com/wiki/Anteatereatingant Anteatereatingant!]]
* PersonalityPowers: Light-based monsters are often benevolent, or [[KnightTemplar overbearing]] and intimidating. Earth monsters are usually [[DumbMuscle unsubtle]], but [[CloserToEarth balanced and grounded]]. Dark monsters are often sinister, but sometimes more "crafty" than evil. (Especially if you associate dark with "magic"). Wind decks are often fast but flighty, and not always dependable; the vast majority of Spell and Trap destroying cards are named after wind effects. Fire decks love roasting the opponent and the "Backfire" card causes them all to be MadeOfExplodium (by burning the opponent when a Fire monster is killed), or else are highly aggressive and hotheaded, burning through their own cards. Water monsters can be weak with surprising HiddenDepths and clever utility.
* PettingZooPeople: The [[http://yugioh.wikia.com/wiki/Gladiator_Beasts Gladiator Beast]] monster archetype, and Beast-Warrior monster types in general.
* PhysicalGod: Obviously not to us, but within the cards there are the Egyptian Gods, Wicked Gods, Sacred Beasts, Earthbound Immortals, and Aesir monsters.
* ThePlague: With a handful of virus cards to play with, very few of them don't dish out immeasurable damage to the opposing player. Crush Card Virus, Epidemic Eradication Virus, Deck Devastation Virus, and Cell Explosion Virus. Did I mention they have ominous names as well?
* PoisonMushroom: "Parasite Paracide" is a card that gets inserted into the opponent's deck face-up. When they draw it, it gets summoned to the field and they take damage. As a side-effect, it also causes all opposing monsters to count as insects (this was back when the main Insect strategy was to take advantage of an opponent's monsters also counting as insects).
** "Mushroom Man #2" damages its controller at the start of the turn, but can be shifted to the opponent at the cost of some of your own life points. This card becomes an exercise in playing "hot potato" with the opponent and it's not very popular these days, since they could just tribute it for a Tribute Summon or use it for a Synchro Summon.
** "Lava Golem" and "Volcanic Queen" are both very powerful monsters with high ATK--but you summon them to the opponent's side of the field. The trick is that they burn their controller each turn (and you get to tribute opposing monsters to summon them, getting rid of some of their cards), so if you're playing a stalling-based deck with indestructible monsters, they're stuck with something they can't easily get rid of that damages them each turn.
* PowerAtAPrice: Low-level monsters with high stats tend to have negative effects (and/or positive to the opponent).
** [[OurWerewolvesAreDifferent Gene-Warped Warwolf]] and [[OurDragonsAreDifferent Alexandrite Dragon]] are exceptions to this rule, however.
** [[GratuitousEnglish Koa'ki Meiru]] run on this. Not only they have high stats, they have powerful ''positive'' effects. Their only downside is that they [[ExplosiveOverclocking self-destruct at the end of your turns unless you keep them maintained]].
* PowerEqualsRarity: ...and the rare cards get pretty expensive.
** As of now there's only twelve Level 12 cards in a TCG composed of ''thousands'' cards, and arguably for [[GameBreaker a very good]] [[OneHitKill reason]].
* PowerLimiter: Part of the backstory behind [[http://yugioh.wikia.com/wiki/Gearfried_the_Iron_Knight Gearfried The Iron Knight]]. When it gets [[http://yugioh.wikia.com/wiki/Release_Restraint released]], [[http://yugioh.wikia.com/wiki/Gearfried_the_Swordmaster look out.]]
* PreciousPuppies: [[http://yugioh.wikia.com/wiki/Outstanding_Dog_Marron Outstanding Dog Marron]]
* PrecisionFStrike: [[http://yugioh.wikia.com/wiki/Oh_F!sh! Oh F!sh!]], indeed!
* PrestigiousPlayerTitle: You are a "Duelist".
* RealRobot: About half of all machine monsters. The other half are {{Super Robot}}s.
* RegeneratingHealth: As long as you have "Marie The Fallen One" in your graveyard, you gain 200 LP each Standby Phase. A lot of other cards can heal as well, but they have to be on the field, where they are wide open to attacks or effects.
* ReptilesAreAbhorrent: The Alien, Venom, Worm, and Reptilianne archetypes. In fact, it's because of this trope that the Aliens and Worms (which are StarfishAliens) are classified as "Reptiles," because they're so ''wrong''.
* ResetButton: The now long-banned card "Fiber Jar" resets pretty much everything in the duel except for Life Points and cards that were removed from play. Its only purpose is to draw out duels and make them even longer, so it was banned to prevent this.
* {{Retcon}}: A few cards have been renamed outright in order to make them fit better with later-released archetypes: "Amazon Archer" became "Amazoness Archer," "Oscillo Hero #2" became "Wattkid," and the various "Heroes," such as the "Elemental Heroes," are now all officially "HEROs," since there are ''five different sub-archetypes'' which use the keyword.
* RetiredBadass: The set "Storm of Ragnarok" heavily implies that the support monsters for the Six Samurai archetype were the original members of the group.
* RevolversAreJustBetter: In every country besides the U.S., Barrel Dragon is known as Revolver Dragon. One look at the original [[http://yugioh.wikia.com/wiki/Card_Artworks:Barrel_Dragon OCG artwork shows why]].
* RiddlingSphinx: [[http://yugioh.wikia.com/wiki/Ordeal_of_a_Traveler Ordeal of a Traveler]] forces your opponent's monsters to win a guessing game if they want to attack you; the art depicts a traveler being questioned by a sphinx.
* RidiculouslyCuteCritter: Many low-level monsters, but special mention goes to the many Kuribohs, the Charmers' familiars, and the Neo-Spacians' Chrysalis forms.
** The Watt and Naturia archetypes are made up almost exclusively of these.
* RockMonster: The Rock-type.
* {{Samurai}}: The "Six Samurai" archetype and all its support.
** Before them, we had the "Sasuke Samurai" cards, though this only consists of four monsters.
* TheScapegoat: [[http://yugioh.wikia.com/wiki/Scapegoat Scapegoat]]
* SceneryGorn: A lot of cards have this, including a few (non-field) magic and trap cards.
* SceneryPorn: Some Field spells are just ''gorgeous'', and if not, the designs are at least ''very'' intricate and detailed.
* SchizoTech: Everything from stone clubs to SteamPunk ancient robots to the [[http://yugioh.wikia.com/wiki/Perfect_Machine_King Perfect Machine King]].
* SchmuckBait: The illustration of [[http://yugioh.wikia.com/wiki/Reckless_Greed Reckless Greed]] shows a greedy man reaching for a treasure chest that is clearly over a trapdoor.
* SealedEvilInACan: Seeing the destruction the war was causing, the Ice Barriers decided to [[IdiotBall unseal]] Trishula, the strongest of the Ice Barrier Dragons. It did [[TheEndOfTheWorldAsWeKnowIt NOT]] [[ResetButtonEnding end well]].
* SealedEvilInADuel: Emulated in [[http://yugioh.wikia.com/wiki/Different_Dimension_Gate Different Dimension Gate]]. And yes, we see the pun in 'duel'.
* SequelEscalation: Remember the old days where summoning more than one monster in one turn is hard to do? Now summoning five monsters with over 2000 ATK in one turn while still having a healthy hand size is completely normal to be seen.
** So much that you could parody the infamous ''YuGiOhTheAbridgedSeries'' scene by matching two decks from two different eras.
*** Blackwings especially get that treatment when it's your first time playing them. If they don't FTK you, they must've gone first (and therefore could not attack).
*** Synchro Monsters in general are this. Now summoning your deck's ace monster is usually done mostly with monster effects and is usually summoned in your first or second turn. In the olden days, you were considered lucky to summon any thing over a level six without deliberately stalling or using Foolish Burial + Monster Reborn.
* SeriesMascot: Kuriboh and Winged Kuriboh have been this for years, Stardust Dragon for the [=5D's=]-era. Number 39: Utopia seems to be shaping up to be the one for the current [=ZEXAL=] era.
** Kuribon and Kurivolt are the variations for [=5D's=] and [=ZEXAL=]. They haven't been used nearly as much as the first two, being just special cards while Kuriboh and Winged Kuriboh had spirit forms. In addition to the Kuribohs, each series protagonist has a monster typically used most by them. Dark Magician, Elemental Hero Neos, Stardust Dragon, and Number 39: Utopia. These monsters always have 2500 attack and 2000 defense.
*** There is also another Kuriboh expy from the first series: [[http://yugioh.wikia.com/wiki/Wretched_Ghost_of_the_Attic the Wretched Ghost of the Attic]].
* SetBonus: Most archetypes rely on internal support.
* ShockAndAwe: Thunder-type monsters. Additionally, a lot of cards that deal with destroying monsters happen to be named after or themed after electricity, like the Thunder Monarch, Raigeki and its variants, Elemental HERO Thunder Giant/Evil HERO Lightning Golem, and so on.
* SiblingRivalry / SiblingYinYang: [[http://yugioh.wikia.com/wiki/White_Magician_Pikeru White Magician Pikeru]] and [[http://yugioh.wikia.com/wiki/Ebon_Magician_Curran Ebon Magician Curran]].
* SigilSpam
** The [[GratuitousEnglish Koa'ki Meiru]] monsters all feature their emblem somewhere on their person.
** [[http://yugioh.wikia.com/wiki/Gusto Gusto]] monsters all carry a metal amulet with a shuriken design on it.
** Most of the cards that use the [[http://yugioh.wikia.com/wiki/Spell_Counter Spell Counter]] mechanic carry the sigil for that theme.
** The Emblem for the [[http://yugioh.wikia.com/wiki/Six_Samurai Six Samurai]] appears in the background of every card in the theme, however the only member to wear the emblem is "Legendary Six Samurai - Shien".
** All the X-Saber archetype have the emblem of an X somewhere on their person. Even more so, the XX-Saber all wear red capes as well has having the emblem.
*** Every post-Trishula Duel Terminal Archetype features a logo of some sort.
* SnipeHunt[[http://yugioh.wikia.com/wiki/Snipe_Hunter er]]
* SoLastSeason: Elemental Hero decks took a major hit when Synchro Monsters came out, and Synchro Monster support (and decks) took a huge hit when Xyz came out.
** Monster Reborn. In the early days, it was considered one of the ultimate splashable cards that could turn the game around in an instant due to how easy it was to automatically summon a powerful unstoppable monster. It was one of the first victims of the Forbidden list because of this. When it was declared to be Limited, people immediately decried it as a bad idea, then realized that in a metagame where multiple Special Summons in a single turn are so frequent, just fetching one monster wasn't so impressive any more. Many other formerly banned cards including Tsukuyomi received this effect for similar reasons.
* SpiderTank: [[http://yugioh.wikia.com/wiki/Launcher_Spider Launcher Spider]] takes this trope literally.
* StarfishAliens: The Alien archetype. Some of the bigger ones border on EldritchAbomination. One of them is even {{cosmic horror| story}} by name! Also, they are the true masters of turnabout. Zeta Reticulant and Greed Quasar are not ''technically'' of the Alien archetype, but are still in the same visual class. The Worms of the Worm archetype are even ''more'' Starfishy, ranging from hideous blobs to rampaging chitinous monstrosities. The only common feature they have is a [[MoreTeethThanTheOsmondFamily toothy, vertical mouth]].
* {{Steampunk}}: The Ancient Gear archetype, though bordering on ClockPunk.
* {{Superhero}}: The [[http://yugioh.wikia.com/wiki/Elemental_HERO Elemental HEROs]]
** AntiHero: Their counterparts, the [[http://yugioh.wikia.com/wiki/Destiny_HERO Destiny HEROs]]
** VillainProtagonist: The [[http://yugioh.wikia.com/wiki/Evil_HERO Evil HEROs]]
** HenshinHero: The [[http://yugioh.wikia.com/wiki/Masked_HERO Masked HEROs]]
* SuperMode: [[http://yugioh.wikia.com/wiki//Assault_Mode /Assault Mode]] for certain Synchro Monsters
** And several for LV Monsters and cards like Vampire Genesis
** Stardust Dragon and Red Dragon Archfiend also have a small handful of other advanced forms.
** Classic cards Blue-Eyes White Dragon and Red-Eyes Black Dragon have a number of other, more powerful forms as well.
* SuspiciouslySimilarSubstitute: Whenever a card is declared Forbidden for being too powerful, Konami tends to release a watered down version of it. A couple of straight examples would be "[[http://yugioh.wikia.com/wiki/Rescue_Rabbit Rescue Rabbit]]" for "[[http://yugioh.wikia.com/wiki/Rescue_Cat Rescue Cat]]", and "[[http://yugioh.wikia.com/wiki/Tradetoad Tradetoad]]" for "[[http://yugioh.wikia.com/wiki/Substitoad Substitoad.]]"
** [[IncrediblyLamePun Wouldn't the latter be a Suspiciously Similar Substitoad...?]]
* TakeMeInstead: There are a few monsters that let you send them to the graveyard to protect your other cards from being destroyed, Stardust Dragon being a famous example.
* TakingTheBullet: [[http://yugioh.wikia.com/wiki/My_Body_as_a_Shield My Body as a Shield]] and [[http://yugioh.wikia.com/wiki/Astral_Barrier Astral Barrier]] have YOU doing this to protect your monsters, so to speak. This is also a recurring theme with the Six Samurai cards; each of the Six can destroy themselves to prevent another one on the field from being destroyed, or to protect Great Shogun Shien.
** Players can subvert this in the case of Astral Barrier by coupling it with [[http://yugioh.wikia.com/wiki/Spirit_Barrier Spirit Barrier]], where you and your monsters effectively protect each other.
** The GX anime-only [[http://yugioh.wikia.com/Doble_Passe Doble Passe]] as well, with the bonus of letting you immediately perform a direct attack on your opponent.
* TakingYouWithMe: Several ways. Activating Self-Destruct Button is one. Playing Ring of Destruction on a monster whose attack is more than both player's Life Points is another. Flipping a Morphing Jar when both players have less than 5 cards in their deck? [[CrowningMomentOfFunny Indeed.]]
* TarotMotifs: The Arcana Force monsters are based on tarot cards, including names and numbers, though not all 22 made the cut. There were also a couple of minor arcana thrown in: Ace of Cups, which randomly may let you or your opponent draw extra cards, and the anime-only Ten of Swords.
* ThatCloudLooksLike: [[http://yugioh.wikia.com/wiki/Cloudians A bunch of monsters!]]
* ThemeNaming: Many archetypes work this way. Those that don't just have common visual themes.
** Some examples: Dark World monsters have a warped version of a color for a name ("Gren," "Goldd," "Silva," "Broww,"). The [[StarfishAliens Worms]] have names beginning with a different letter of the alphabet, from A ("Worm Apocalypse") to Z ("Worm Zero"). Gladiator Beasts all have Roman or Greek themed names.
* TimeBomb: [[http://yugioh.wikia.com/wiki/Blast_Sphere Blast Sphere]], [[http://yugioh.wikia.com/wiki/Adhesive_Explosive Adhesive Explosive]], and [[http://yugioh.wikia.com/wiki/Jigen_Bakudan Jigen Bakudan]], though going by its rulings, the latter's effect is instantaneous.
* TimeMachine: [[http://yugioh.wikia.com/wiki/Time_Machine As seen here.]]
* TimeToUnlockMoreTruePotential: The basis of the Gemini monsters, who must be normal summoned after already being on the field to gain their effects. There are cards to bypass this limitation, however, which may overlap with EleventhHourSuperPower.
* {{Toon}}: [[http://yugioh.wikia.com/wiki/Toon The Toon Monsters]].
* TransformingMecha: The [[http://yugioh.wikia.com/wiki/Morphtronics Morphtronics]] archetype.
* TrapMaster: [[http://yugioh.wikia.com/wiki/Trap_Master He destroys traps rather than setting them, though.]]
* TricksterArchetype: The Jars. The majority of them have game-breaking effects that can turn entire strategies upside-down...and the artwork indicates that they do it all with [[ItAmusedMe a huge, goofy smile on their face.]]
* TrueCompanions: The Six Samurai, who can sacrifice each other if another one would be destroyed.
* UltimateShowdownOfUltimateDestiny: [[http://yugioh.wikia.com/wiki/Last_Turn Last Turn]], which pits two monsters against one another to decide the winner of the duel.
* UltimateUniverse: [[http://yugioh.wikia.com/wiki/Duel_Terminal The Duel Terminal]] verse, with a cohesive storyline, (akin to MagicTheGathering or TabletopGame/DuelMasters) streamlined rules, and even an UltiMatum [[http://yugioh.wikia.com/wiki/Duel_Terminal_-_Pulse_of_the_Trishula analogue]].
* UnderwearOfPower: The Ojamas. All of them.
* UnPerson: Konami has been taking the focus away from Synchros and Tuners ever since the debut of ZEXAL, which takes place in an alternate reality where they never existed, all in favor of the new Xyz mechanic. The former two have also been hit hard in the banlists, in contrast to the latter. The still running 5Ds manga is the last refuge for new Synchros and Tuners for the real life game.
* UnrealisticBlackHole: Dark Hole.
* UnskilledButStrong: A well-built deck that resolves around normal monsters are rather powerful at the cost of having no effects. It should also be noted that they are immune to cards that affect Effect Monsters.
* UpToEleven: Monsters that are Level 8 are usually the strongest monsters you're likely to see in a deck, and they usually don't have an ATK of over 3000. Any effect monster with 3000 or higher ATK or a Level of 9 or higher usually has much stricter summoning conditions or an AchillesHeel, but they make up for it by being really powerful.
* VendorTrash: A high proportion of any given booster pack set will be this, especially in the early sets flooded with weak monsters that had no effects. Though as the game evolved, support cards such as [[http://yugioh.wikia.com/wiki/Instant_Fusion Instant Fusion]] (used for easy XYZ summons) and [[http://yugioh.wikia.com/wiki/Advanced_Ritual_Art Advanced Ritual Art]] gave those previously ignored cards playability.
* VillainousRescue: When your opponent attacks one of your Fiend-type monsters, you can send that Fiend to the graveyard, as well as one in your hand, to bring out [[http://yugioh.wikia.com/wiki/Darkness_Neosphere Darkness Neosphere]], a monster with 4000 attack and defense that can't be destroyed in battle!
* TheVirus: Ekibyo Drakmord returns to its owner's hand (so long as it's not destroyed or the equipped monster is removed from the field), allowing it to spread to other monsters.
** "DNA Surgery" can be seen as this, too, as its effect changes all monsters on the field to a single type (chosen by the cards activator). "DNA Transplant" does the same thing, but with Attribute in place of type.
** [[http://yugioh.wikia.com/wiki/Parasite_Paracide This]] little [[IncrediblyLamePun bugger]] as well.
** [[http://yugioh.wikia.com/wiki/Tribe-Infecting_Virus Tribe-Infecting Virus]]
** The Alien Archetype is based largely on using this to weaken monsters.
** The [[http://yugioh.wikia.com/wiki/Verz Verz]] Archetype is entirely composed of previous monsters from the Duel Terminal world [[http://yugioh.wikia.com/wiki/Corrosive_Contagion_Infestation corrupted by some kind of virus]], leaving the infected as mindless beasts of destruction.
* [[WaveMotionGun Wave Motion]] [[http://yugioh.wikia.com/wiki/Wave-Motion_Cannon Cannon]]
* WeakButSkilled: In general, there are a lot of cards with low attack and defense points that have powerful effects. There's even a few archetypes based around WeakButSkilled cards, like the Frogs, the Watt monsters, Ojamas, and so on.
* WeaponOfChoice: The common theme for the Equip Spell Card-based Guardian archetype.
** AnAxeToGrind: [[http://yugioh.wikia.com/wiki/Guardian_Grarl Grarl]]
** {{BFS}}: [[http://yugioh.wikia.com/wiki/Guardian_Baou Baou]]
** BoomStick: [[http://yugioh.wikia.com/wiki/Guardian_Kay%27est Kay'est]]
** DualWielding: [[http://yugioh.wikia.com/wiki/Guardian_Tryce Tryce]]
** KnifeNut: [[http://yugioh.wikia.com/wiki/Guardian_Elma Elma]]
* WindUpKey: This [[http://yugioh.wikia.com/wiki/Legendary_Wind-Up_Key spell card]] and [[http://yugioh.wikia.com/wiki/Wind-Up the Archetype]] it supports
* WingedHumanoid: The Harpie Lady archetype, [[http://yugioh.wikia.com/wiki/Elemental_HERO_Avian Elemental HERO Avian]], quite a few of the [[http://yugioh.wikia.com/wiki/Blackwings Blackwings]], some of the monsters that look [[http://yugioh.wikia.com/wiki/Absorbing_Kid_From_The_Sky like]] [[http://yugioh.wikia.com/wiki/Shining_Angel angels]] and Yubel, or at least before she goes OneWingedAngel...
* WingedUnicorn: [[http://yugioh.wikia.com/wiki/Crystal_Beast_Sapphire_Pegasus Crystal Beast Sapphire Pegasus]]
* {{Wolfman}}: [[http://yugioh.wikia.com/wiki/Lycanthrope Lycanthrope]], and any with "Warwolf" in the name.
* WordOfGod: Two, as a matter of fact; until 2008, card rulings were given by both Konami and UDE, and they didn't always agree with each other. Many cards actually have different rulings for the TCG and OCG versions of the game because of this.
** It's notable that in case of disagreement between the companies, it's rare but not impossible for the TCG's claims to gain worldwide sway in terms of deciding how cards actually work once word of the disagreement gets across the Pacific - and any cases where the TCG's claim does stand ultimately stand because the OCG and TCG management departments agree that "that works better for our purposes." Ultimately, the game's management (at least in some senses, including rulings) considers YGO to be 1 worldwide game with different names in different regions; and the OCG is the origin point, thus it's the locale that holds sway a good chunk of the time. Points of disagreement that aren't ironed out are simply points of disagreement that either went unnoticed or were noticed but deemed unimportant; but while a disagreement DOES exist, you are required to follow the orders of your own jurisdiction, regardless of whichever side you think will "win" the argument.
* TheWorfEffect: The [[http://yugioh.wikia.com/wiki/Millennium_Shield Millennium Shield's]] flavor text states that it is rumored to be able to block any kind of attack. Despite this, all of the [[http://yugioh.wikia.com/wiki/Shield_Crush other]] [[http://yugioh.wikia.com/wiki/Kaminote_Blow cards]] that depict the shield show it in the process of shattering.
* XtremeKoolLetterz: Invoked by the Xyz monsters. The original Japanese literally didn't correspond to any actual word known, [[HexyzForce aside from a term from a completely unrelated ATLUS game]], and that term literally spawned a response of "it couldn't POSSIBLY BE THAT" out of the fanlators. That situation, combined with how Konami has made text errors in its printings before (re: the Zombie-Type's OCG name being "Undeat" rather than Undead thanks to such a mistake), made folks think of "Exceed" as a term that not only fit thematically but suffered from a hearty amount of AscendedFanon. Cue the TCG release in which the very Konami article on the first [=ZeXal=] structure Deck included the name and the following line:
--> 'It's pronounced ik-seez'
** Apparently the name is a reference to spatial coordinates, which would fit the backstory in which the Xyz monsters came through a black hole, originating from a dimension of reverse-time.
** If you're curious, the initial fan translation (which is so ubiquitous that it is still in use by most fansubbers and lots of fans) was "Exceed Monster". This transliteration was supported by the end of YuGiOh5Ds, where characters "exceeded their limits" roughly once an episode, coupled with the hypothesis that in-universe the Exceed (Xyz) Monsters were an alternative to Synchro Monsters.
* YinYangBomb: Chaos monsters, which are generally {{Game Breaker}}s. To summon them, you merely have to remove from play one Light and one Dark monster out of your graveyard. A {{nerf}}ed version of them, the Sky Scourges, require a much heftier and more specific version of the same cost (three dark fiends and one light fairy, or three fairies and one fiend).
** Later, there were also other monsters also released with the word "Chaos" in their name; most of them involve some sort of combination of a Light and Dark monster. Chaos Goddess and Elemental HERO Chaos Neos are a couple of them.
** There's also "Light and Darkness Dragon," which counts as both a light and dark monster; its main deal is that it blocks ALL card effects from happening, but becomes weaker each time it does; when it inevitably gets destroyed, you can choose any other monster in your graveyard to resurrect (and then blow up all OTHER cards you control). So it's protection, destruction, sacrifice and rebirth all at once--perfect for a creature of both light and darkness.
** "Elemental HERO Darkbright," a fusion between a light and dark Elemental HERO monster. It has a powerful piercing attack, but makes itself vulnerable immediately afterwards by shifting to defense position. If it gets killed, though, you get to destroy an opposing card, too.
* YinYangClash: Many examples, but one of the biggest is the ongoing and escalating Duel Terminal battle originally between the [[http://yugioh.wikia.com/wiki/Steelswarm Steelswarm]] and the [[http://yugioh.wikia.com/wiki/Vylon Vylon]], which has now become a battle between the corrupted [[http://yugioh.wikia.com/wiki/Verz Verz]] and the [[http://yugioh.wikia.com/wiki/Sacred Sacred]].
* YouGottaHaveBlueHair: And red...and green...and some purple...
** The Dark Magician in particular is notable for having a different hair color in each of his five seperate artworks.
** The Charmers' hair corresponds to their attributes.
* YoureNothingWithoutYourPhlebotinum: Some cards have variable ATK and DEF, represented with a "?" instead of numbers. If they get hit with something that negates their effect, their ATK and DEF become zero. So they are literally nothing without their powers.
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