Ashiok, the Mind Warper

+1: Put a -1/-1 counter on up to one target creature and gain control of that creature until your next turn.
-3: Until your next turn, whenever a creature enters the battlefield under an opponent's control, it fights another random creature you don't control
-8: You get an emblem with "Whenever a permanent you don't control becomes tapped, it's controller exiles the top card of their library."