IIRC in Yugioh there is only a certain number of Blue-Eyes (from the show?), so you could put a rule on the card 'there may only be X Blue-Eyes on the battlefield at any time', Star Wars CCG used to have permanents that you could have 2 or 3 copies of in play, in addition to stuff you could only have 1 of, the concept would work fine here too, only this could care about both players' boards
The list below is very much what counter burn looked like in Mirrodin block and shows why it was not quite tier one, having to play things like Mystical Tutor and Boomerang are unpleasant, the lack of threats makes actually winning hard and stuff that resolves is a royal pain
The card was reprinted with new artwork for the Pokmon SNAP Best Photo Contest - only 15 copies of this card exist and were handed out to the winner of the contest
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Duel Monsters 6 also used kanji
Most Monster Tokens do not have physical versions, so players may use any object that can indicate battle position to represent them, and their stats are listed on the cards that Summon them