Great Pit of Carkoon

Great Pit of Carkoon enters the battlefield tapped.
{t}{1}
{2}: Sacrifice a creature, exile it instead of putting it in your graveyard.
{5}{t}: Destroy target creature an opponent controls. Exile it instead of putting it in their graveyard.
{7}{t}: Create a X/X red green black Legendary Creature token named Sarlacc, where X is equal to the total power of creatures exiled with Great Pit of Carkoon.