Nathrhag, Mind Devourer

Devoid (This card has no color.)
Nathrhag, Mind Devourer can only be cast from
exile. When you draw this card, you may exile it
for half it's converted mana cost.
When Nathrhag, Mind Devourer enters the battlefield, exile all permanents target opponent controls.
"The Abyss beckons to you, mortal. Whispering.
Calling. Can't you hear it? Whispering."