Caliburn

When Caliburn enters the battlefield choose an
ammo type and reload 15 (put up to 15 of
the chosen ammo type onto Caliburn from any
permanent you own. )
Equipped creature gets +X/+0 where X is equal
to the amount of the counters on Caliburn, and
it also gains reach and "{t}: reload 15"
Whenever equipped creature attacks, remove
a counter of the chosen ammo type.
Equip {1}