Manaflow Band changes

Manaflow Band (S2) Cooldown lowered from 75s to 45s Changed from [your next ability used has its mana or energy cost refunded] to [your next ability refunds 35% of its mana or energy cost] [New Effect] "If the ability damages an enemy or aids an ally, permanently gain 15 mana."

Changes on PBE.

I am tremendously unhappy with the state of mana in league of legends, some champions feel like no matter how hard they try they just never go oom (camille, lulu) while others don't have mana to last for 3 rotations (draven, zilean, morg).

Back in the day of mana potion's I'd use around 10 per game as a draven main, I stopped maining draven when they were removed. We were promissed that mana issues would be adressed on a per champion basis but nothing ever happened to my mana starved champion pool. Until this keystone.

The original prener manaflow band could almost fix the issues on some of my support pool and I was having moderate sucess with it, but now because of ??????? it's being nerfed for the 3rd time into another indirect ryze buff (which btw needs to be nerfed not buffed more) instead of doing what it should do from the start which is provide an option for champion with mana issues.

I can't understand why this was nerfed the first time, the second, or the third, we had no explanations apart from, it's too strong, while the rune gives no power by itself. I just wanna be able to sustain my mana after 2 trades in bot lane which result in the enemy lane going back to full hp because of targon brace fleet footwork, while I stare at my empty mana pool are realise harass has been dead for several seasons and my adc will die for the 3rd time this game because once again I used all my mana on a 100 damage double stun trying to keep him alive and can't ult as zilean once again.

Personally If the problems is mid lane mages abusing it, make it a keystone with stronger effect for supports. And please balance mana costs better if we must live with another nerf to it, it makes no sense that a lulu spamming shield can outshield for less cost a bard's cosmic binding and never lose mana while the bard goes oom 2min later.