How Ryze should be reworked

We all know that ryze is sitting at 45% w/r since ages, yet riot is still nerfing him because of his impact in pro play, so i thought i could come up with an idea on how to balance ryze for solo q while nerfing his impact in pro scene, since we all love ryze's kit , the change will only hit his Ultimate: R : (Passive) : ryze gains (15/20/25)% additional damage. R : (Active) (Toggle) : Ryze consumes 5% of his maximum mana every 1 second to gain 20% cooldown on his off-ultimate skills whenever he uses a skill in addition of 20% movement speed. Killing an enemy refreshes 20% of ryze's maximum mana, Assists refresh 10%.

Since Ryze no longer has his old ultimate "Realm Wrap", his roaming potential drops alot, his ability to place a great amount of pressure in pro scene using his ultimate vanishes aswell, also using his new ultimate drains his mana like mad, 50% in 10 seconds + his abilities cost, which means he runs out of mana in 5 seconds and renders completely useless if not played carefully, and since teamfights in pro scene usually take a long time, ryze won't be as impactful, however his carry potential through damage increases alot and thats whats needed in solo Q.

I'm waiting for your feedbacks.