Roxanna, The Deadly Butterfly

At the end of your turn, summon X 1/1 Butterflies with flying and lifelink, where X is the number of nontoken creatures you control that die this turn.
{1}-Sacrifice 1 Butterfly: Gain 1 life and your opponent loses 1 life.
{t}-Sacrifice 6 Butterflies: Destroy target nontoken creature or enchantment.