Avacyn's Commander

Flash, Haste
{w}{t}: Target creature gains indestructible until end of turn.
{b}{t}: Sacrifice a creature you control: Destroy target creature you don't control. It cannot be regenerated. Avacyn's Commander does not untap during your next untap step.
She follows Avacyn full-heartedly, whether or not the guardian we once had is now corrupt. Her incarnate warrior is just as evil.