Obelisk the Tormentor

Haste, hexproof, vigilance
As an additional cost to play this spell, sacrifice
three of your creatures.
{t}Sacrifice two of your creatures to destroy all creatures your opponents control.
"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."