Soraka's mana costs are oppressive now
I just played her in a game of ARAM. Only mana item I got was Athene's. I was playing against an AP heavy team including nidalee, so I didn't exactly have a ton of room to stock up on mana replenishing items. Building more mana items just wasn't a possibility based on that game's needs.
I think that adding a mana cost to her E really hurt her (she can't self-cast it anymore either). This is specially true in extended teamfights, which ARAM is. 50 doesn't sound like a lot, but when you have a Q which requires a lot of MPS at later ranks (to get her W up ASAP). Her W isn't cheap either.
I really wonder how much riot tested her last nerfs before pushing her through. Yes I get it her win rate was starting to freak riot out. However, it's been a few weeks and she's still at 44% win rate. That's a pretty significant liability to a team.
I'd like to say just build
as her core build...
Realistically, that costs almost 10,000, and you still needs boots and other items. Supports can't afford those 3 items in most games (unless they get crazy fed) and she'd still have to buy a sightstone and gp/5 item first. Taking her mid or top might make it easier to afford those items, however she's still not getting many kills and riot just made it harder for a solo lane Soraka to push.
I know a lot of people hate her, but a lot of people like her too and I just don't see her being a viable champ right now. Who knows when her rework is coming. I understand it'll take awhile and there are other champs being worked on. She really needs help now. At least partly roll back her last nerf a little.
. Never gets old.