Nihilego

Wither, predator (Whenever a creature dealt
damage by Nihilego this turn dies, put a +1/+1
counter on Nihilego)
{b/r}{b/r},{t}: Gain control of target creature an
opponent controls until end of turn. Untap that creature. It gains haste until end of turn. When
you lose control of the creature, Nihilego deals
damage equal to its power to that creature.
Activate this ability only any time you could
cast a sorcery.