Ulamog, the Defiler [Modern Horizons 3 Prerelease Promos]

When you cast this spell, target opponent exiles half their library, rounded up.



WardŃSacrifice two permanents.



Ulamog, the Defiler enters the battlefield 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.