Ren, Soulblade Shinobi

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 an opponent cast a spell, except the
first one each turn, Ren, Soulblade Shinobi deals
1 commander damage to that player.
Partner (You can have two commanders if both have partner.)