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Several cards fall into this range, such as PSA 10 Lugia Neo Genesis or high-grade Japanese promo card from the 2000s

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

I suspect its price will drop lower as more copies enter the market, but this enchantment is always good for $20 or more despite all its reprints

They were removed from the game years ago, but were added back with Temporal Forces