Renekton's Passive

I feel that most of the community can agree that Renekton's passive is invisible and has no actual impact on him as a whole (for those who don't know, the passive gives Renekton 50% more fury gain when he is below 50% health).

This passive is, for one, incredibly lackluster and cannot be built around, nor should you even dare to build around it. Secondly, it rewards players for taking damage, and in reverse punishes players for healing/avoiding damage. With a new passive, we could give Renekton an even more unique identity and late-game viability.

I feel that a passive that revolves around Renekton's "rager", "tortured-into-insanity", and "mentally broken" archetypes could solidify Renekton's thematic identity and give us the feel of playing a psychotic butcher. What I propose is a passive mechanic revolving around Renekton applying stacks to a Champion by dealing damage to them with his abilities (and basic attacks?) Once Renekton manages to reach a certain amount of stacks within a certain time frame, he gains bonuses towards to his victim. Only one enemy Champion can affected at a time, and after they have been afflcited, they cannot become victim again for a while.

Bonuses that Renekton would gain towards his target could include: Bonus movement speed when moving towards the afflicted champion Bonus percent damage (max, current, or missing) Bonus true damage (a la Garen) Lifesteal and/or Spellvamp Reduced incoming damage

What do you think? Would this be a good passive for Renekton? Or something else entirely?