Before in PBE this item had two actives. The active we have now and another active you could use on your own turrets to increase the damage of it. For some reason this change didn't make it this season so now it remains useless like every other season. This is what I was thinking to make it better.
Give the stats a little buff or give it a different item path to work around it.
Give it the secondary passive that it had in PBE or change the secondary passive to the old Fortify summoner spell on your turrets.
Change the passive so that it because something useful late game instead of movement speed when you run towards enemy towers. This is a huge problem because it doesn't work on dead turrets.
This item works against itself. The farther into the game you go, the worse the item gets. Is that satisfying to you?