Splinter, Leader of the Four

Commander Ninjutsu {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 Splinter, Leader of the Four deals attacks, create a 1/1 black and blue rat ninja token tapped and attacking. This token is a copy of another target attacking ninja and is exiled at the next end-phase.