Zaphragor, Death`s Incarnage

All creatures you control get +1/+1.
When Zaphragor, Death`s Incarnage enters the battlefield, choose Death or Life.
Death: Sacrifice Zaphragor. All creatures you
control get +4/+4 as long as Zaphragor is in your graveyard.
Life: At the beginning of each combat, Zaphragor
deals 4 damage to target creature. If this creature
dies, Zaphragor get`s +X/+X, where X is this creatures power.