Ashiok, the Phantasm

+3: Target opponent puts the top 10 cards of his or her library into his or her graveyard.
-3: Put three 3/3 Blue and Black Illusion Creature Tokens with haste and "Sacrifice this creature on your next turn." onto the battlefield.
-12: Gain control of all creatures and all enchantments from all graveyards. They enter the battlefield tapped.