The Famine Devil

When you cast this spell, target opponent exiles the top half of their library, rounded up.
Ward—Sacrifice two permanents.
The Famine Devil enters with a number of +1/+1 counters on it equal to the greatest mana value
among cards in exile.
Famine has annihilator X, where X is the number
of +1/+1 counters on it.

"Anything... for my little sister." - Famine