Empty jars

Empty jars enters the battlefield with {x} light counters on it.
Whenever you cast an instant or sorcery spell, put a light counter on Empty jars.
{t}: Remove 8 light counters, create four 2/2 blue red Firefly creature tokens with flying, pay {1}{r},{t}: Sacrifice a Firefly creature: deal damage equal to the sacrificed creature's power to target creature or player.