Venom

Death touch, Menace
{x}{p/b}{p/u}: If there are no creatures exiled by this
card, Exile target creature with X toughness.
{u/b}:Venom gains +X/+X, where X is the power of
the creature exiled by this card, until end of turn.
At the beginning of each end step, put a
consumption counter on the creature exiled by
Venom. Then, if the exiled card has consumption counters equal to its CMC, put it into its owners Graveyard and put a +1/+1 counter on
Venom.