Dairoku, the Hidden Fang

Commander Ninjutsu {u}{b}{g} (This ability costs {1} more to activate from the command zone for
each time you've used it from the command zone)
First Strike
Whenever this creature deals combat damage to a
player, you may search your library for a creature
with ninjutsu, put it into your hand, then shuffle.
Ninjutsu abilities you activate cost {1} less.