Skarner Rework Idea

So, to preface, I was a big fan of Skarner pre-juggernaut. I felt he was finally in a fair and playable spot. He had good strengths, obvious weaknesses, and no rediculous free-lo mechanics to complain about. He was simple, but still had room for skill expression with the use of his passive, and Q was still his main skill.

As of right now, Skarner has a pathetic passive that feels (to me) like a poor attempt at homage to a removed game mode (RIP dominion). The rest of his Kit is stacked onto his E skill, and his Q is a poorly scaling glorified Sheen proc. E has: Initial damage, slow, stun+damage on proc, passive bonuses for 1 second on proc (attack/move speed + mana regen), self-cooldown reduction on proc.

When thinking about how I would rework Skarner, I first thought about how his Q was his bread and butter skill, and in the description it reads, "Skarner charges himself with Crystal Energy..." and I thought, why not a unique resource for this champion? I also saw that they experimented with something similar when making Nasus (thanks Jeremy GamingCurious) so the idea wouldn't be too hard for Riot to implement. So here is the short version (no numbers) of my idea:

Passive is now Crystal Energy, Skarner's unique resource. Auto attacking and using Crystal Slash gather crystal energy. The more energy he has, the faster he moves/attacks. (up to a cap, obviously), Energy falls off as Skarner moves around and uses abilities other than Q.

Q: Same, gathers energy per enemy hit, does bonus magic damage while skarner has Crystal Energy available. While empowered, it still gathers energy per enemy hit, but costs 1 point of Energy as well.

W: Costs Crystal Energy, same shield and ramp up speed mechanic, speed breaks with shield. If shield lasts for the duration without breaking, refund a portion of the spent energy.

E: Costs Crystal Energy to fire, no longer slows missile speed as it passes through targets. Targets are marked, procing mark stuns enemy for 1 second and restores extra crystal energy.

R: Same effect: Skarner rapidly gains Crystal Energy over the duration of the suppression. Each rank in R prevents Skarner's Crystal Energy from dropping below a certain point through sheer movement. (Can still drop below threshold from using abilities.)

This is a round draft thought, but would love to hear your thoughts on it.

EDIT: I had also thought of adding a poison sting as a passive on his ultimate: Every 5th/4th/3rd strike is an attack with his stinger, which poisons his target, slowing for a short duration and dealing bonus magic damage based on the target's health (haven't decided if current, missing or max would be most appropriate.)

EDIT 2: Food for thought:

"Skarner is a melee fighter. Who excels at not only dealing damage, but also controlling the battlefield. Utilizing basic attacks in addition to his abilities, Skarner is a true Hybrid fighter." ~Skarner Original Champion Spotlight