Calldown: Railgun

When Railgun enters, create a 1/1 white
S.E.A.F. Trooper token and attach this to it.

Equipped creature has first strike and +1/+0
for each charge counter on Railgun.
Whenever equipped creature attacks or blocks, add
a charge counter to railgun.
Sacrifice this equipment if it has 5 or more charge counters on it.

Equip {2}