This isnt feasible in real life scenarios, such as situations where you have someone breathing across from you
Creating three tokens for 3 mana is going to be good and will trigger a lot of the other cards in your deck nicely
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
Protecting your cards in sleeves and binders isn't enough: they can continue to be damaged by friction caused by the movement of binder pages, for example
Black tends to work best for milling when paired with blue, because its small attacks do advance a milling strategy
The set was originally teased on February 27 (Pokmon Day) in a brief, very vague aside during the lackluster Pokmon Presents