Vengeful Mistform

Flying
Undead Ninjutsu {b}{r} ({b}{r}, Sacrifice an
unblocked attacker you control: Put this card
onto the battlefield from your graveyard
tapped and attacking. It enters with a finality
counter on it.)
When Vengeful Mistform deals combat damage
to a player, you may discard a card. If you do,
draw a card.