Fukurokuju, Orochi's Shadow

Commander Ninjustsu {1}{u}{b} ({1}{u}{b}, Return
an unblocked creature you control to your 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 exile the top card of your
library and lose 1 life, until your next upkeep
you may play that card without paying its
mana costs.