Krom's Sidearm

Whenever Krom's Sidearm enters the battlefield,
put 3 ammo counters on it and attach it to target creature.
Whenever equipped creature attacks, you may
deal 3 damage to opponent you are attacking,
remove an ammo counter.
Shock-Whenever Krom's Sidearm deals damage,
each creature that player controls takes 1 damage
{3}Equip to target creature