Santhar, apprentice of Rakdos

{b}{r}{t}: Destroy target tapped creature.
{b}{r}{1}{t}: Destroy target creature.
{b}{r}{2}{t}: Exile target creature.
{b/r}: Discard the top card of your library. Santhar deals 1 damage to each opponent.
Santhar's Power is equal to how many cards you have in your grave yard.