Crazy Idea for a Ryze Rework

(If you want a quicker overview just skip to the spells at the bottom)

Ok so bear with me on this because I think it would probably be a dramatically different champion mechanic from what is currently in the game. I know that Ryze is on the block to be reworked, and I had a random idea that seemed pretty awesome for him.

1. To me the thing that ticks about Ryze, what makes him unique is that he scales and works off mana. I think Riot should highlight that. Instead of having flat mana costs and a percent of his total mana on his ratios he should have his mana costs be a percent of his total mana. So for example at rank 1 his Q mana cost would be 12% of max mana. I would then give his other spells very low ap ratios, and have them scale based on mana used so x% of mana cost becomes damage (Riot would have to play around a lot with the numbers to balance properly). I would then replace the current passive that is a shield and crd (not the stacking part) and replace that with the aoe spell vamp from his current ult. His new ult would double the mana cost of all spells and abilities (raising damage a ton too).

My ryze would be a huge burst threat, and still a late game focused champion.

Summary: Passive: Each spell cast grants a stack lasting 6 seconds, upon 5 stacks each spell becomes aoe and grants spell vamp (scaling at 6 11 and 16)

Q: Targeted projectile, dealing a base amount + x% ap + y% mana cost (its possible/probable that this % will be greater than 1x on all of his spells) of spell mana cost mana cost = x% of max mana

W: Shoot a laser in direction of cursor after a brief delay (think baby lux ult) dealing reduced damage to minions, but equal damage to all units affected (minion damage =regular damage x percentage), dealing a base amount + x AP + y% mana cost. I would personally give this greater damage than the q because it is a skill shot not targeted

E: Thrown aoe skill shot (similar to heimerdinger stun) that slows enemies by some percent + 2% per 100 mana deal medium base damage but have very limited damage scaling via ap and % mana used

R: Passive: Grants 200/350/500 Active: Doubles the mana cost on spells used grants 15% movement speed (if too weak maybe all grants passive?) for 5/7.5/10 seconds