The creature cards you return to your hand don't have to be any of the cards you milled
You see, you can pay one Blue and one Black mana and tap it to put a 1/1 Zombie into play
However, what makes me love this counterspell even more is that if the spell is successfully countered, it is exiled instead
Conjurer's Closet allows you to repeat ETB effects like those of the splicers, constantly building up your token army
While the deck did have some issues - mostly due to my inexperience - I found that the idea was solid
But you can only have one Moonmist in your Commander deck, so to make this combination work, you're going to need your creatures to work well together when you don't have Moonmist in hand, and most of the Final Fantasy flip cards just don't gel all that well