Zed, Master of Shadows

Eminence — As long as Zed, Master of Shadows is in the command zone or on the battlefield, ninjitsu costs cost {x} less, where X is the number of unblocked creatures you control.
Commander Ninjitsu {5}{u/b} ({5}{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.)
Shadow