Yuriko, the Tiger's Shadow

Commander ninjutsu {u}{b} ({u}{b}, Return an
unblocked attacker you control to hand: Put
this card onto the battlefield from your hand
or the command zone 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.