Yuriko, the Tiger's Shadow is a mythic Legendary Creature — Human Ninja card from Magic Online Promos (PRM), collector number 86214.
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.