Banish the Nonbelievers

As an additional cost to cast this spell, you may reveal a Vampire card from your hand.
Destroy target permanent. If you revealed a vampire card, target permanents controller looses 3 life and you gain 3 life.
Madness {b} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or
put it into your graveyard.)