Cauldron of Grudges

{2}, {t}: Put a charge counter on Cauldron of
Grudges.
{2}, {t}: Double the number of charge counters on
Cauldron of Grudges.
{2}, {t}, Sacrifice Cauldron of Grudges: Destroy
any number of target creatures with converted
mana cost X where X is the number of charge
counters on Cauldron of Grudges.