Keiko, Shadow's Breath

Commander Ninjutsu {2}{u}{r}
Whenever Keiko, Shadow's Breath deals combat
damage to a player, that player sacrifices a
creature, or if they can't discards a card. Create
X 2/2 Zombie tokens, where X is the
sacrificed/discarded cards Mana cost.
Sacrifice a Zombie Army Token with Power
3 or greater: Return Keiko, Shadow's Breath
to her Owner's hand.