Foniás, Eternal Assassin

+1: you get an emblem with, "creatures card in your graveyard gain evoke equal to your devotion to black, blue, and green"
-3: destroy all creatures with converted mana cost less than or equal to the creatures in your graveyard
-7: the next time a creature enters the battlefield, return all creatures from your graveyard to the battlefield. Foniás can be your commander