All Devourer

Devoid, Flying, Trample

Whenever a permanent leaves the battlefield, put a +1/+1 counter on All Devourer.

Tribute—Pay 15 life (At any time you may pay this card's tribute cost. When you do, it permanently gains the abilities printed below.)
Whenever All Devourer attacks a player, it gains Annihilator X, where X is that players life total.