Kozilek, Bane of Time

+6: Exile target creature you don't control. At the end of this turn, return that creature under your control as a colorless creature with +1/+1.
-8: You may return up to four creatures from exile under your control with +2/+2, annihilator 1 and as a colorless thrall creature.
-12: Exile all creatures you don't control. If you exile more than 12 creatures, you win the game.