Chizuru, Mirror Maiden

Ninjutsu {1}{u} ({1}{u}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Whenever Chizuru, Mirror Maiden or one or
more Illusions you control deals combat damage
to a player, create a 0/0 blue Illusion creature
token with "This creature's power and
toughness are equal to the number of Illusions
you control" and "When this becomes the target
of a spell or an ability, sacrifice it".