Kirra, Agent of Venom

{b}, Reveal Kirra, Agent of Venom from your
hand: Put a hit counter on target creature.
Activate this ability only during your turn.
Ninjutsu {b}{g} ({b}{g}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Whenever Kirra, Agent of Venom deals combat
damage to a player, destroy each creature with
a hit counter on it.