Pond, Dreadful Revenant

Menace
Whenever a creature you control dies, you may
exile it instead of putting into your graveyard
until Pond, Dreadful Revenant leaves the battlefield. If you do, return Pond, Dreadful
Revenant to the battlefield.
Pond, Dreadful Revenant gets +X/+Y, where
X is the exiled creature's power and Y is its
toughness.