I came up with W-passive for Morde [poll included]

I'm open minded and welcome all criticism (as long as it isn't flaming)

Here it is:

Mordecaiser power increases the less health he has.

It'd increase both his AD & AP by max 20% (I'm bad at balancing, it's just a concept. It could boost his AD less than AP. Also that for him to use 20% He'd need to be VERY low on HP)

Why? His spells cost HP. By giving him this passive we'd give Mordecaisers a choice:

"To try my luck with 50% HP to deal more damage or to play it safe with full HP"

I do know it's passive that punishes players for hitting Morde, but Imo it's slightly less toxic than "no matter what we do Morde will still level up faster because of his W".

Also with this passive he could be alot better option solo. He no longer would have to rely only on 2 abilities + R.

Last thing. We already have similar passives: Olaf -> less hp -> faster AS Aatrox -> Less HP -> better LS Veigar -> Less MP -> Better mana regen

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What do you guys think?