Solo the Last Immortal

When you cast this spell, target opponent exiles half their library, rounded up.
Ward Sacrifice two permanents.
Solo the Last Immortal enters the battlefield with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile. Solo has annihilator X, where X is the number of +1/+1 counters on it. this card is a copy of Ulamog, the Defiler