Emulek, the end of all

Devoid (This card has no color)

Eminence—As long as Emulek is in the command zone or on the battlefield, Eldrazi you control have "Sacrifice this creature: you get {c}{c}"

Whenever an eldrazi you control dies, reveal cards from the top of your library until you reveal an eldrazi card with lesser mana value. You may cast that card without paying its mana cost.