Ebony Maw

+1: Choose a target creature you don't control. Target creature gets a -1/-1 counter at the start of each turn.
-1: Tap target creature. Target creature does not untap during its owner's next untap step. Creatures you control get +2/+0 until end of turn.
-8: Gain control of two creatures you don't control. Untap them. They gain haste. All opposing creatures get -10/-2 until end of turn.