Black Lightning

Necro {1}{b}(When you cast this spell, you may remove
a creature card with {1}{b} in its casting cost from your graveyard. If you do, this spell costs {1}{b} less to cast.)
This spell costs {1} more to cast for each target
beyond the first. Black Lightning deals X damage divided evenly, rounded down, among any
number of targets. Creatures damaged by Black Lightning that die this turn return to play under
your control. Sacrifice them at the end of your
next turn. Skip your next untap ste