Ulamog, the Ceaseless Hunger is a mythic Legendary Creature — Eldrazi card from Battle for Zendikar (BFZ), collector number 15. Current market price: $21.93 (foil $38.12), TCGplayer market prices via Scryfall.
When you cast this spell, exile two target permanents. Indestructible Whenever Ulamog attacks, defending player exiles the top twenty cards of their library.