Creating three tokens for 3 mana is going to be good and will trigger a lot of the other cards in your deck nicely
Black tends to work best for milling when paired with blue, because its small attacks do advance a milling strategy
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
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In the Pokmon Trading Card Game, new sets become legal for tournament play on the second Friday following the sets release