Yurie, the Deathstrike

Ninjutsu {3}{b}{b} ({3}{b}{b}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Deathtouch
Whenever Yurie, the Deathstrike deals combat damage to a player, that player's life total becomes X, where X is the number of cards in their hand.