History GameBreaker / CardBattleGame

* The Sevens cards, Rosemon's Lure and Download Digivolve in DigimonDigitalCardBattle, all of which counts as InfinityPlusOneSword.

* ''VideoGame/YuGiOhReshefOfDestruction'': Any GameBreaker from ''The Sacred Cards'' applies here, but a newly introduced card is The Winged Dragon of Ra's Phoenix Mode, only available by inputting a special code. It can be discarded in the hand, which triggers its graveyard effect and automatically summons its Battle mode version, which can only be destroyed by an opponents monster, has 4000 attack points and no elemental weakness.
* ''VideoGame/YuGiOhDuelistOfTheRoses'' has a lot of broken cards only available through hacking, passwords, or the Destiny Draw mechanic. Card Reincarnation can get you Darkness Approaches, which is broken for the same reason as it was in ''The Sacred Cards'', and there are two monsters it works wonderfully with: Mystical Elf, which when flipped raises the attack power of all Light monsters (including itself) by 800 points, and Wood Remains, which raises the attack power of all Wood Remains on the field by 500. The kicker here? You can get a Wood Remains by fusing a zombie and plant monster that both have less than 1000 attack points, and you can get a Mystical Elf by fusing either Dancing Elf or Wing Egg Elf with a Fairy-type monster with less than 800 attack points. These materials are easy to farm from the right opponents and significantly raise the number of potential copies of these monsters a deck can bring out.

* In ''VideoGame/YuGiOhReshefOfDestruction'': The Winged Dragon of Ra's Phoenix Mode can be discarded in the hand, to immediately appear on the field in Battle Mode. [[note]]It doesn't necessarily guarantee a win, though, if your opponent can lower its Attack/Defense Points with Effect Cards.[[/note]]
* Sevens, Rosemon Lures and Download Digivolve in DigimonCardBattle, all of which counts as InfinityPlusOneSword.
** Digimon support are another, since some effect are exclusive to them, and some are ridiculously powerful. Rare types in general have lots of it, who have several number manipulation ability, most notably Toy-Agumon, that make the entire game a breeze.

** The combo of the Destiny Draw mechanic, which automatically placed a designated card on top of your Deck if you were losing, was remarkably abusable, letting you put game-winning cards on top of your Deck in the second turn with some good management of your Life Points. After Glow, which shuffles itself into the Deck and wins the Duel if you draw it on the next turn, was probably the worst offender.

* The ''Tag Force'' games allow you to use certain cards that were only in the anime, like the Dark Synchros. Ordinarily, they're DifficultButAwesome, with their raw power balanced out by the trickiness in using a 0-ATK, high-level Dark Tuner to summon it... unless that Dark Tuner is Doom Submarine. Doom Submarine can revive itself once per game while you control no monsters, and it's Level 9, meaning it can summon pretty much any Dark Synchro you could want. Summon Submarine, Normal Summon something else... free Dark Synchro.

** Fog Castle, which revives a monster up to four times after it gets destroyed, is incredibly abusable with any card whose effect activates upon destruction. How does knocking 35 cards from your opponent's Deck with a Voltic Bicorn sound? How about using Sangan to instantly draw out Exodia? If that wasn't enough, when Fog Castle runs out of uses, you get to take four monsters from your Graveyard and add them to your hand.

* The ''Tag Force'' games allow you to use certain cards that were only in the anime, like the Dark Synchros. Ordinarily, they're DifficultYetAwesome, with their raw power balanced out by the trickiness in using a 0-ATK, high-level Dark Tuner to summon it... unless that Dark Tuner is Doom Submarine. Doom Submarine can revive itself once per game while you control no monsters, and it's Level 9, meaning it can summon pretty much any Dark Synchro you could want. Summon Submarine, Normal Summon something else... free Dark Synchro.

** Philosopher's Stone Sabatiel may be limited to one, but it can be added from your Deck to your hand whenever you lose a Winged Kuriboh, so it's incredibly easy to draw (especially with a Flute of Summoning Kuriboh). What's it do? Let you pay half your LP to add any card from your Deck to your hand. And then it goes back to the Deck, letting you play it again. After three activations, it turns from its original effect to one that multiplies one monster's ATK for a turn by up to 5... and somehow, that feels like a downgrade.

*** The lesson of just how game-breaking these sort of attack boosts are is taught to the player very quickly via Witch's Apprentice, a card the player ''starts with''. It works like Hourglass of Life, except it only powers up Shadow-element monsters. Which in itself is overpowered, because of how the game's ElementalRockPaperScissors works. In theory, it's Shadow > Light > Fiend > Dreams > Shadow. The problem with this is that Dreams-element monsters are ridiculously rare, to the point where encountering ''one'' in the ''entire game'' is an event unto itself, making Shadow an unintentional InfinityPlusOneElement. And on the off-chance that you do encounter such a monster...well, that's what your trap cards are for.

*** For that matter, almost any trap card in the game, because the AI is stupid enough to attack every time it has a chance to win that particular battle. This definition of "chance" includes your face-down monsters. All you need to do is the following: set trap, set monster, end turn, laugh as the opponent kills themselves, attack with all face-up monsters, and repeat until you have won the duel. Traps like Invisible Wire (kills anything under 2000 ATK that attacks you, which no enemy except the final boss can summon without a tribute), Acid Trap Hole (everything under 3000 ATK), and Widespread Ruin (just everything) make the game insultingly easy. To make matters worse, these cards have a deck cost that is absurdly low; deck cost acts sort of like your CharacterLevel, determining the relative power of your deck. Widespread Ruin costs less than the local [[TheGoomba Goombas]] to put in your deck, and the other traps cost even less than ''that''. Only Torrential has anything even vaguely resembling a real cost...which you can still pay at the very beginning of the game with minimal effort.

* ''Franchise/YuGiOh: The Sacred Cards'' had an absurd number of these...so many that the difficulty comes from trying to determine which of these are the ''most'' game-breaking. To give a few {{egregious}} examples:

** Hell, the elemental rock-paper-scissors mechanic ITSELF is a game breaker. Remember: type advantage trumps all other statistics when determining the winner of a battle (so a Light-type, 0/100 Unhappy Maiden can slice through every single Fiend in the game, uncaring of its ATK/DEF). Now, take into consideration that two Duelists you face - Weevil Underwood and Mako Tsunami - run one single type of monster in their entire deck (Forest and Water respectively). You can get a stupid amount of cash and deck Capacity purely by making a decent deck filled with Beasts, Insects, etc., adding in 6-9 chump change Fire type monsters (Fire trumps Forest), and beating in Weevil's face over and over and over (since after you first beat him, you can duel him endlessly). You can do the same with Water creatures against Mako, running cheap Thunder monsters to steamroll everything he runs, but he does have much better cards than Weevil - Weevil must rely on Pinch Hopper to then drop his Insect Queen, and even then she'll be slain by a Flame Viper that is weaker than half the cards you started with.

** Shardflame Phoenix. This card's level 1 stat is already pretty amazing, but its level 2 is epically horrible. That is, until you gain a rank (which happens once every four turns) and that level 2 instantly transform into a level 3 monstrosity with high enough stat to one-shot 99% of all creatures available in the game, and when it dies, it will [[TakingYouWithMe nuke the creature face-to-face with it]], along with their owner. Then it returns as a lowly level 2 Phoenix. Which can later grow into level 3 again.

* Online card game [[http://www.elementsthegame.com/ Elements: the Game]]: the Aether element is badly overpowered, with such charming things as multiple completely untouchable monsters and a shield that just makes you invulnerable to non-spell damage for three turns, but the real killer has to be the Entropy element weapon, Discord. If your opponent gets out a Discord in the first few turns, you will almost certainly die, because the special power of Discord is to randomly shunt your [[{{Mana}} quanta]] around - typically reducing high ones, like, say, the types your deck is based on. The incredibly rare Shards only make balance worse - the aether-aligned one, the Shard of Wisdom, enables you to turbocharge the already obnoxiously strong immortal creatures (which can't be affected by ''any'' spells or targeted abilities other than the Shard of Wisdom, making them almost totally impossible to kill) so that they become significantly stronger and deal spell damage, which bypasses nearly all the shields in the game. They also have access to Mindgate, a permanent item which, for an upkeep of 2 Aether quanta, effectively allows them to see what the next card in their opponent's deck will be...[[PowerCopying by copying it.]] Finally, they can also spend 7 Aether quanta to activate Parallel Universe, another card which copies any targetable creature on the field. That 10/10 Golden Dragon you brought out? They now have one too, and at 5 less total quanta cost.

* Online card game [[http://www.elementsthegame.com/ Elements: the Game]]: the Aether element is badly overpowered, with such charming things as multiple completely untouchable monsters and a shield that just makes you invulnerable to non-spell damage for three turns, but the real killer has to be the Entropy element weapon, Discord. If your opponent gets out a Discord in the first few turns, you will almost certainly die, because the special power of Discord is to randomly shunt your [[{{Mana}} quanta]] around - typically reducing high ones, like, say, the types your deck is based on. The incredibly rare Shards only make balance worse - the aether-aligned one, the Shard of Wisdom, enables you to turbocharge the already obnoxiously strong immortal creatures (which can't be affected by ''any'' spells or targeted abilities other than the Shard of Wisdom, making them almost totally impossible to kill) so that they become significantly stronger and deal spell damage, which bypasses nearly all the shields in the game. They also have access to Mindgate, an permanent which, for an upkeep of 2 Aether quanta, effectively allows them to see what the next card in their opponent's deck will be...[[PowerCopying by copying it.]]

* Online card game [[http://www.elementsthegame.com/ Elements: the Game]]: the Aether element is badly overpowered, with such charming things as multiple completely untouchable monsters and a shield that just makes you invulnerable to non-spell damage for three turns, but the real killer has to be the Entropy element weapon, Discord. If your opponent gets out a Discord in the first few turns, you will almost certainly die, because the special power of Discord is to randomly shunt your [[{{Mana}} quanta]] around - typically reducing high ones, like, say, the types your deck is based on. The incredibly rare Shards only make balance worse - the aether-aligned one, the Shard of Wisdom, enables you to turbocharge the already obnoxiously strong immortal creatures (which can't be affected by ''any'' spells or targeted abilities other than the Shard of Wisdom, making them almost totally impossible to kill) so that they become significantly stronger and deal spell damage, which bypasses nearly all the shields in the game.

* In ''VideoGame/YuGiOhReshefOfDestruction'': The Winged Dragon of Ra's Phoenix Mode can be discarded in the hand, to immediately appear on the field in Battle Mode. [[hottip:*:It doesn't necessarily guarantee a win, though, if your opponent can lower its Attack/Defense Points with Effect Cards.]]

* ''LostKingdoms'' can be broken by ignoring the maximum deck size and instead making a small deck comprised of nothing but the most powerful attack cards you have and "recover used cards" cards.

* In YugiohReshefOfDestruction: The Winged Dragon of Ra's Phoenix Mode can be discarded in the hand, to immediately appear on the field in Battle Mode. [[hottip:*:It doesn't necessarily guarantee a win, though, if your opponent can lower its Attack/Defense Points with Effect Cards.]]

* ''{{Yu-Gi-Oh}}: The Sacred Cards'' had an absurd number of these...so many that the difficulty comes from trying to determine which of these are the ''most'' game-breaking. To give a few {{egregious}} examples:

* Exodia in ''{{Yugioh}}: 7 Trials to Glory''. The game has a special area in which ''there is no banned/limited list'', which means you're not only allowed three separate copies of each Exodia piece in your deck, you're allowed three copies of Sangan and Witch of the Black Forest to search them out, AND three copies of Dark Hole, which destroys all monsters on both sides of the field, nuking the opponent's offense while allowing your searchers to do their job. There is also access to 3 copies each of Pot of Greed and Graceful Charity, which all together accounts for ''fifteen cards'' with essentially no penalty. The in-game currency reward system has a strong bias towards winning through non-standard means (and Exodia is considered non-standard); what this means is that you get ten times the normal winnings for performing ''poorly''. You can even buy a Deck that is ''pre-made with all the above cards''.

*** For that matter, almost any trap card in the game, because the AI is stupid enough to attack every time it has a chance to win that particular battle. This definition of "chance" includes your face-down monsters. All you need to do is the following: set trap, set monster, end turn, laugh as the opponent kills themselves, attack with all face-up monsters, and repeat until you have won the duel. Traps like Invisible Wire (kills anything under 2000 ATK that attacks you, which no enemy except the final boss can summon without a tribute), Acid Trap Hole (everything under 3000 ATK), and Widespread Ruin (just everything) make the game insultingly easy. To make matters worse, these cards have a deck cost that is absurdly low; deck cost acts sort of like your CharacterLevel, determining the relative power of your deck. Widespread Ruin costs less than the local [[TheGoomba Goombas]] to put in your deck, and the other traps cost even less than ''that''. Only Torrential has anything even vaguely resembling a real cost...which you can still pay at the very beginning of the game with minimal effort.

* Exodia in ''{{Yugioh}}: 7 Trials to Glory''. The game follows the rules of the real-life card game, in which despite being an automatic instant win, Exodia isn't particularly a huge deal due to the sheer difficulty in summoning it, so what's the problem? First, the game has a special area in which ''there is no banned/limited list''. The difficulty in summoning Exodia comes mainly from the fact that you're allowed 1 copy of each of the 5 cards necessary to summon it, and only one copy of Sangan (which can add any of the five cards from your Deck to your hand). Without bans or limits, you're not only allowed three separate Exodias in your deck, you're allowed three Sangan to fish it out, AND three copies of the outright banned Witch of the Black Forest (which is essentially a better version of Sangan), AND three copies of Dark Hole, which destroys all monsters on both sides of the field. Since Sangan and WotBF have their effects activate when you destroy them, all you have to do is nuke the field while your side is filled with Sangan and WotBF, add any Exodia pieces that aren't in your hand, win. With the additional note that your opponent doing anything to destroy your monsters is playing right into your hands. And let's not forget normally banned/restricted cards used for drawing more cards, especially Pot of Greed (draw 2 cards with no penalty) and Graceful Charity (draw 3 cards with a negligible penalty for this deck style). To cap it all, winning by a means other than the normal "reduce opponent's life points to 0" gives you 5000 DP (the game's currency), whereas getting 500 DP winning the normal way is pretty good. Winning in the third or fourth turn doubles your winnings, the second quintuples it, and the first gives you tenfold. Getting such quick wins with this deck style is incredibly easy; after a few games, you'll have no excuse to run out of money ever again. You can even buy a Deck that is ''pre-made with all the above cards'' (though admittedly you do have to beat [[ThatOneBoss R. Hunter]] to buy said Deck); naturally, after doing this all difficulty goes completely out the window.

** Digimon support are another, since some effect are exclusive to them, and some are ridiculously powerful. Rare types in general have lots of it, who have several number manipulation ability, most notably Toy-Agumon, that make the entire game a breeze.

* In YugiohReshefOfDestruction: The Winged Dragon of Ra's Phoenix Mode can be discarded in the hand, to immediately appear on the field in Battle Mode. [[hottip:*:It doesn't necessarily guarantee a win, though, if your opponent can lower its Attack/Defense Points with Effect Cards.]]

* Exodia in ''{{Yugioh}}: 7 Trials to Glory''. The game follows the rules of the real-life card game, in which despite being an automatic instant win, Exodia isn't particularly a huge deal due to the sheer difficulty in summoning it, so what's the problem? First, the game has a special area in which ''there is no banned/limited list''. The difficulty in summoning Exodia comes mainly from the fact that you're allowed 1 copy of each of the 5 cards necessary to summon it, and only one copy of Sangan (which can add any of the five cards from your Deck to your hand). Without bans or limits, you're not only allowed three separate Exodias in your deck, you're allowed three Sangan to fish it out, AND three copies of the outright banned Witch of the Black Forest (which is essentially a better version of Sangan), AND three copies of Dark Hole, which destroys all monsters on both sides of the field. Since Sangan and WotBF have their effects activate when you destroy them, all you have to do is nuke the field while your side is filled with Sangan and WotBF, add any Exodia pieces that aren't in your hand, win. With the additional note that your opponent doing anything to destroy your monsters is playing right into your hands. And let's not forget normally banned/restricted cards used for drawing more cards, especially Pot of Greed (draw 2 cards with no penalty) and Graceful Charity (draw 3 cards with a negligible penalty for this deck style). To cap it all, winning by a means other than the normal "reduce opponent's life points to 0" gives you 5000 DP (the game's currency), whereas getting 500 DP winning the normal way is pretty good. Winning in the third or fourth turn doubles your winnings, the second quintuples it, and the first gives you tenfold. Getting such quick wins with this deck style is incredibly easy; after a few games, you'll have no excuse to run out of money ever again. You can even buy a Deck that is ''pre-made with all the above cards'' (though admittedly you do have to beat [[ThatOneBoss R. Hunter]] to buy said Deck); naturally, after doing this all difficulty goes completely out the window.