Obelisk the Tormentor

Indestructible
Obelisk the Tormentor can't attack or block
unless you control at least three other creatures.
You can sacrifice two creatures; destroy all
creatures your opponent controls.
The descent of this mighty creature shall be heralded
by burning winds and twisted land. And with the
coming of this horror, those who draw breath
shall know the true meaning of eternal slumber.