Great Idea for New Champion!

Ok, so I'm going to design a champion based on the route Riot is going right now. ANY input might be nice, I fear that it might be a little underwhelming

Name: H. Tubman (The Original Freerunner) Passive: Every hit increases MS by 3/7/10, for a maximum of 100. Q: Medium range (1200 range) laser skill-shot that slows all people hit and stuns people at the end. Kind of like Jinx W. W: Doubles all MS bonuses for 5 seconds and allows recast for short range blink that damages and stuns everyone around champion. E: Increases attack speed based on MS (passive). Cast for AOE heal, based on current MS, and speeds up all allies within the area for 3 seconds. R: Consumes all MS bonuses and grants shield based on AD and MS for 5 seconds. Explodes on duration end, but cooldown resets/halves on kill/assist.

I don't know if it has enough mobility, but what do you guys think?