Yuriko, the Tiger's Shadow - 364 R CMM

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 mana value.

rare
Legendary Creature — Human Ninja
From the Magic: The Gathering set Commander Masters.