Exhtep

Devoid, Annihilator 1, Protection from Colorless
{c}{w}{u}{b}{r}{g}{x}: Target permanent you control
with converted mana cost X becomes an X/X
Avatar with your choice of Annihilator 1, First
Strike, Flying, Deathtouch, Trample, or
Hexproof. If that creature dies this turn, all
players lose X life. Exile that permanent during
the end step.