Fire Staff

It depends on the effect you want to recreate. To make it shoot a fireball, you could create a ranged item which shoots a projectile that looks exactly like a fireball and has a procedure trigger when colliding a block that makes it explode.

If You Wanna To Make Item That Shooting Fireballs, You Can Do Next:

1.Make It A Ranged Weapon, Then Add Trigger When It Collides With Block

2.Make It Item, Then You Making Procedure In "When Right Clicked In Air" And Make Command Summon

3.Code It.

make a projectile find the mod name of the projectile summon fireball tp fireball to projectile