Ulamog, the Ceaseless Hunger is a mythic Legendary Creature — Eldrazi card from Commander Masters (CMM), collector number 670. Current market price: $23.73 (foil $26.13), 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.