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Yu-Gi-Oh!? Cardcaptor Sakura? Duel Masters?
Edited by Pichu-kun
The device wasn't actually strapped to their arm, but the kids in Digimon Tamers would use cards to control their Digimon, and could turn into Digimon themselves.
To add to potential 'mon anime, could it be Bakugan? I don't think there were arm things, but I didn't see the later seasons. There were gold editions of the monsters, though.
Gormiti: The Lords of Nature Return! had kids becoming monsters and, in season 2, also get golden armors, but they had no arm things with cards.
The best character is always the one-shot disguise.
I'm looking for a anime tv show that aired on Cartoon network in the 2000's maybe the 90's it was a tv show Where they World have these cards and a thing on their arm Where they Would sjove the card on top or in the thing on the arm and they would transform into monsters and there were also gold form/edition of the monster they were
Edited by DynamicCapybara