Cerberus, Apex Predator

Haste, Trample, Viligance
When you cast Cerberus, Sacrifice a creature.
Each opponent loses life equal to the sacrificed creature's power and toughness.
Cerberus's power is equal to the number of
creatures in all graveyards. It's toughness is
equal to your life total. {p/b}{p/b}, Sacrifice a creature, destroy target creature an opponent control's.
{p/g}, Sacrifice a creature, return target creature
card from your graveyard to the battlefield.