Ulamog, the Ceaseless Hunger [Battle for Zendikar]

Set: Battle for Zendikar Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {10} When you cast this spell, exile two target permanents.IndestructibleWhenever Ulamog, the Ceaseless Hunger attacks, defending player exiles the top twenty cards of their library. A force as voracious as time itself.