Gunsmith

When Gunsmith enters the battlefield, create a colorless Bullet artifact token for each gun you
control.
Whenever a gun enters the battlefield under your
control, create a colorless Bullet artifact token.
{1}, sacrifice a bullet: Put an ammo counter on
target gun control.
{4}, {t}: Search your library for a gun card and put
it in your hand.
Gunsmith's power is equal to the
number of guns you control.