March of Wretched Sorrow

Marcia del Dolore Miserabile (March of Wretched Sorrow) (it)

Instant (CMC 1)
As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs less to cast for each card exiled this way.
March of Wretched Sorrow deals X damage to target creature or planeswalker and you gain X life.