Darkseid Unleashed

+2: Exile the top card of each library. Until the end of your next turn you play these cards. Spend mana as though it were any color to cast them.
-X: Darkseid Unleashed does X damage to each creature and each planeswalker your opponents control.
-12: You get an emblem with ("Creatures you control have Annihilator X where X is the cards converted mana cost.")