Ashiok, the Bolas Mother

+2: Fateseal 3. (To fateseal 3, look at the top three cards of an opponent's library, then put any number of them on the bottom of that library.)
-1: Sacrifice a creature: Target player mills cards equal to the sacrificed creature’s power.
-10: Each opponent reveals cards from the top of their library until four land cards are revealed, and puts all cards revealed this way into exile.