Taiga, Princess of Ruin

{u},{t}, Discard a card: Tap target creature. It
doesn't untap during its controller's next untap
step.
{1}{b}{b},{t}, Discard a card: Destroy target creature.
{x}{r},{t}, Discard a card: This ability costs 1 more
to cast for each target beyond the first.
Taiga, Princess of Ruin deals X damage divided evenly, rounded down, among any
number of targets.