Ulamog, the Defiler is a mythic Legendary Creature — Eldrazi card from Modern Horizons 3 (MH3), collector number 15. Current market price: $19.50 (foil $19.61), TCGplayer market prices via Scryfall.
When you cast this spell, target opponent exiles the top half of their library, rounded up. Ward—Sacrifice two permanents. Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile. Ulamog has annihilator X, where X is the number of +1/+1 counters on it.