Shredder the Vengeful

Commander ninjutsu {3}{b}{b} ({3}{b}{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.)
First strike, deathtouch
Whenever Shredder the Vengeful deals combat
damage to a player, they lose half their life,
rounded up, unless they discard their hand.