Derek, The Cloaked Tiger

Commander Ninjutsu {u}{b}{g} (This ability cost
{1} more to activate from the command zone for every
time it has been used from the command zone.)
First strike
When 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.