The Problem With Mana Regen
Recently a lot of people have been talking about the overnerfed Athene's and it's effective replacement in Morello's. Riot nerfed Athene's because it's a 'cure all' for mana regen, and are nerfing Morello's for the same reason. I think there is a fundamental problem with mana regen, in that it's not a stat that you really ever want, it's a stat that you have to sink a certain amount of gold into to be relevant.
The only other stat in the game that shares this discrepancy from other stats is mana itself on champions outside of Ryze, but this problem is alleviated somewhat by Seraphs Embrace giving you extra AP and the shield. This makes mana feel better as a stat to build and makes it feel like less of a mandatory gold sink.
The main problem with mana regen is that it lacks anything at all to make it something that isn't just 'you need to sink 2.5K gold into this stat and never have to worry about it again'. There's no interesting uses for your mana regen, it just kind of sits there being a gold sink that you need to buy. I think that by making mana regen items with interesting passives and actives could help to make mana regen far more interesting, even more so if the effects were somehow bound to your mana regen.
