What if Darius did more damage the more health the enemy had with his rework? *JUST AN IDEA*

I'm just going to throw this idea out there, but I had an idea on what if in his rework, they made him the one true tank buster who dealt more damage the more health an enemy had?

For his passive I was thinking, it would stack 10 times, and each stack would do 1% max health plus a flat amount over 5 seconds, all the way to 20% late game with 10 stacks.

So for math, at early game if he managed to get 10 stacks off his enemy, the flat damage was say 10, he would deal 100+10% of their max HP, late game it would scale all the way to 30 flat damage, resulting in 300+20% of enemies max hp over 5 seconds.

That seems a little op but here's some more math.

Enemy Renekton at level 3 with roughly 800 max hp gets 10 stacks on him by Darius, ignoring resistances, he would take 100+80 damage over 5 seconds, IF he had all 10 stacks on him.

Late game Renekton with 5000 hp gets 10 stacks on him, he would take 300+500 damage over 5 seconds, IF he had all 10 stacks on him.

The philosophy is that if Darius is allowed to cut into his opponents for a LONG time, they deserve to take a TON of damage.

The only things I could see Darius doing more damage based on the enemies health are his passive and ult. He would lose his armor pen and be compensated with higher base movespeed to 345 and a slight cooldown reduction on his E at all ranks(2 seconds each rank). He would lose his Attack Speed Slow but instead it reduces the enemies damage output for 2.5 seconds by 10/12.5/15/17.5/20%.

His ult would have NO scaling based on Darius's stats, only based on his enemies total HP and a flat amount.

It would do 30/45/60(+1%/1.5%/2% of enemies max HP) capping at 300/450/600(+10%/15%/20% of enemies max HP)

For some math, at level 6 Darius gets 10 stacks off an enemy Renekton who has 1.2k health and ults him, his ult would deal 300+120 damage to the Renekton.

Level 18 Darius gets 10 stacks off an enemy Renekton who has 5k health and ults him, his ult would deal 600+1000 damage.

The jist of it is, Darius deals less damage to people with low health, and MORE damage the more health built against him.

He loses his armor pen, he still does magic damage with his passive because it wouldn't be good if it did physical for cases of black cleaver and some other stuff that I can't think of.

Thoughts? While it probably is op as fuck I just wanted to get the idea that if the enemy had more HP, Darius would deal more damage to them.