Nyhilo, Eye of Insanity

Flying, Shroud
This creature starts with {x} soul counters,
where {x} is the amount of creatures in the
opponents graveyard. Sacrifice {x} soul counters
where {x} is the converted mana cost of Target
creature. Return target creature to your hand.
"Insanity is strongest in the eye, the
gateway to one's soul"
-Valik