At the beginning of combat on your turn, put a charge counter on this Equipment.
Equipped creature gets +1/+1 for each counter on this Equipment.
As long as this Equipment has four or more counters on it, equipped creature has
double strike (This creature deals both first-strike and regular combat damage.).
Equip — Pay

or remove a counter from this
Equipment
(Pay
or remove a counter from this Equipment: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.).