Shen Kenzo

Commander ninjutsu {1}{u}{b} ({1}{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.)
Creature cards in your hand have ninjutsu {x}{u/b}, where X is that creature's converted mana
cost minus one.
Shen Kenzo can't be blocked.