Mistwraith

Ephemeral (Creatures with ephemeral do not enter
with summoning sickness. However, they will
self-destruct at the end of the turn.)

Mistwraith's power and toughness is equal to the
number of creatures in your graveyard.

These specters of the Isles shed their identities long
ago to become amalgamations of pure,
unappeasable hunger.