Antique Laser Gun

This artifact enters the battlefield with 3 charge counters.
{t}: Place a charge counter on Antique Laser Gun.
Tap equipped creature, spend a charge counter:
Deal 3 damage to target creature.
Tap equipped creature, spend 3 charge counters:
Deal 5 damage to target creature.
Tap equipped creature, spend 5 charge counters:
Deal 7 damage to target creature.
Equip {2}