New Champion Idea: Nimrod, the Stealthy Hunter

I've been working with this idea for a marksman champion who focuses on vision control.

Passive: Hybrid Theory Nimrod's basic attacks do 50% AD as Physical Damage and 50% AP as Magic Damage.

Q: Curse Shot Nimrod's next basic attack gains range and deals extra magic damage. If the empowered attack kills its target, Curse Shot's effect permanently increases by 2 Magic Damage. If the target was a large monster or large minion, +4 instead. If the target was a Champion or Epic Monster, +6 instead. Essentially, this is a Magic Damage take on Nasus' Q.

W: Smoke Cloud Nimrod tosses a handful of smoke pellets at target area, reducing vision of all enemies within it and applying a MS and AS slow.

E: Vision Probe Nimrod plants a sensor pack at target area, which activates after 1.5 seconds. Once active, the probe grants vision to his team, can be teleported to, and reveals all hidden items and units within its radius.

R: Come And Get Me Nimrod vaults onto target enemy, knocking them down for 3/4/5 seconds. Their Armor and Magic Resist are reduced by 25/50/75% and all damage he would otherwise take is redirected to them. If the target dies before the ability ends, Nimrod has a few seconds when he can select another target. (Like Darius' ultimate) At skill-level 3, the ability completely resets upon the target dying.