Hunger of Zimud

Devoid (This card has no color.)
Devour 3, Ingest, Annihilation 3 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with three times that many +1/+1 counters on it. Whenever this creature deals combat damage to a player, that player exiles the top cad of his or her library. Whenever this creature attacks, defending player sacrifices three permanents.)