Vlad Ability Replacement Suggestion

He's got delays in when he can do damage when he fights, which is why he usually gets shit on if he's against anyone with burst. What if his E or ultimate was replaced? My suggestion is that it's a toggle that deals damage in an AOE with amping damage, health cost, and heal based on how long it's active. In duels he'd have to be cautious in it's use due to not getting enough sustain from just the one enemy, but in teamfights and when clearing large minion waves it could be left on. Heal would be increased when affecting champions.

I doubt Riot will react to this but hey, what do you think? How would you balance my suggestion?