Xinrath, the Void Unleashed

Devoid, flying, wither
At the beginning of your upkeep, put a -1/-1
counter on each other creature, then gain control
of each creature you don't control with three or
more -1/-1 counters on it.
Exile a permanent you control: Put three +1/+1 counters on Xinrath, the Void Unleashed.
You know not the bottomless malice the Eldrazi are
capable of.