Devex, Rotting Executioner

{g}, Sacrifice a creature: Return a Zombie
creature from your graveyard to you hand.
Devex, Rotting Executioner gains +X/+0 until
end of turn where X is equal to the sacrificed
creature's power.
{b}, {t}: Destroy target non-black creature with toughness less than Devex, Rotting Executioner's
power.