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/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.