Yuriko, the Tiger's Shadow

Commander Ninjutsu {u}{b} ( {u}{b}Return an
unblocked attacker you control to its owner's
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.