phoenix fire like effect

[baydiver]

as title says i'm still in search of a phoenix fire like effect:
i'm working with some other guys on recreating a battleships-like map for sc2 and it is based on weapons(items) which u can shop which randomly fire at 1 random enemy at a time within their range (each weapon has to acquire a random target on each shot)

and exactle there is the problem...we gfound a solution for almost everything except the most important thing...weapons(in form of shopable items) which have that acquire random target on each single shot of each item effect...found a solution for weapons that randomly acquire a target for all weapons at the same time and then shoot till the enemy is dead or out of range...but nothing that fulfils my requirements above...
search and google didnt help