Tyrehn, Syndycate Recruiter

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 you may put a Ninja creature
from your hand onto the battlefield tapped.
Partner (You can have two commanders if both have partner.)