Why are all your suggestions mirrors of systems that are in League of Legends? First the egirl bait character Alice (monetarily speaking, it's not the worst idea), and now a complete item mechanic ripoff.
Wouldn't this item apply the effect on McGinnis turrets, thus be a Liandry + Heimer tower situation and ultimately be a must buy?
Sounds like a balancing nightmare in a 3D shooting game, where shooting is somewhat important. Luckily, Valve is known for their creative endeavors.