Yuriko, The Tiger's Shadow

Commander ninjutsu {u}{b} ({u}{b}, Return an
unblocked creature you control to hand:
Put this card onto the battlefield from
your hand or the commandzone tapped and attacking.)
Whenever a ninja you control deals combat
damage to a player, reveal the top card of your
library and put that card into your hand.
Each opponent loses life equal to that card's converted
mana cost.