Could we do this smallish change on Ezreal's W

Mana Cost: 70/80/90/100/110

(NEW) Whenever Essence Flux hits a champion it regains mana. This only works on the first target hit by Essence Flux.

Mana Regained: 20/30/40/50/60

Hard ability to hit, punishes harder for missing, but rewards the Ezreal for hitting his spell.

I think this helps AP Ezreal a lot and let's AD Ezreal not waste as much mana when using a rather weak spell for himself. to buff his Teammates atk spd or damaging the enemies a little.