Zac balance idea

I'd love to see Zac get a little love, to make him not a niche pick but more of a staple pick. My idea is to change his W or Q slightly, adding a HP-ratio to it, giving him a dmg source when building tank. (Building ap even when ahead is really lack luster). Adding the cost of skill to the dmg, wouldn't make zac overpowered, it would scale with Zac's overall idea. Smaller Zac does less dmg bigger Zac is scarier, and does more dmg.