Shinobi of Last Commands

Ninjutsu {w}{u} ({w}{u}, Return an unblocked
attacker you control to hand: Put this card onto the
battlefield from your hand tapped and attacking.)
Whenever Shinobi of Last Commands deals
combat damage to a player, investigate.
Whenever you sacrifice a Clue, return Shinobi
of Last Commands to its owner's hand. Then,
put up to one artifact card from your hand
onto the battlefield.