glory of team rocket booster box japanese Opening TWO Boxes!! The anticipation of what you will find Pokemon Scarlet & Violet Glory

Then, cleaning the das*n

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

Take a look at some of the early winners: During pre-sale season, I'd ignore the listing prices because supply is so thin