The issue with an item bringing mages into botlane is what would stop Midlane mages from buying it? You would have to make a pretty ridiculous item for that singular item to be what bridges mages bot, but it would have to be limited so that the item could ONLY work botlane. otherwise it will just get abused in mid.
As for this one, the main item is pretty overpowered with its passive alone (depending on the ratio) with tacking 70 ap on it makes it a dream. The secondary maiming star is just something no mage would want. I cast this active and then what? I lose 70 ap for assumedly 34 mana and negligible damage? Seems like a waste to me.
Furthermore, this item in particular will make certain on hit champions very strong. Kayle comes to mind as a prominent figure. This plus nashors plus guinsoos is a lot of free on hit magic damage. Even the likes of Kai'Sa and Varus could abuse this.
Speaking of nashors, this item is basically just a nashors tooth. It follows roughly the same design principle and it hasn't allowed mages to lane bot.
Overall, it's a bit of a mess that wouldn't being mages botlane. If we focus on auto attacks adcs will always have the upperhand because they are designed that way. If you want to make mages viable bot you would have to make their strengths apparent on their own without trying to shoehorn them into another classes specialty.