Akira, The Shadow Lotus

Commander Ninjutsu {u/b}{u/b} ({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, send target permanent that Player controls
back to their hand.
{2}{u/b}{u/b} Target creature becomes a Ninja.
{u/b}{u/b} Return target creature you control back
to your hand.