Zezgak, Wretched Hunter

Annihilator 3, Devoid (This creature has no color)

This creature's power is equal to the number of creatures in all graveyards.

Eminence — As long as this creature is in the command zone or on the battlefield, whenever an opponent sacrafices a creature, you may pay X, where X was that creature's converted mana cost, if you do, you may put that creature onto the battlefield under your control, except that it is a colorless eldrazi drone in addition to it's other colors