Suggestions for Essence Reaver

I know it's getting a component called soul scythe, but I still think this item should have much more to offer, especially in the early game. As a mana-focused item I think it should also include maximum mana and some passive mana per second, to increase your overall mana pool and allowing a bit of sustain outside of combat. The maximum mana could also help it synergize with other mana items like Manamune. Also, a passive that gave a small burst of mana upon killing a unit could be nifty. Hopefully, changes like these could make Essence Reaver a more valuable item or serve as a good niche item for champions like Jayce and Ezreal.

I'm not suggesting any numbers, because that's not in my ability to decide and I hope my suggestions won't somehow destroy the game and make it the most unbalanced item ever.