@RIot, Soraka is going the way of Mordekaiser
Riot, I'm determined to become the Malicious Metal of the Soraka playerbase. I will never shut up about the way you're treating Soraka.
First, A quick glance over her history for her Heals:
Initial Release: W was a large Heal over time much Like Warlock's (Dota/Dota 2) Heal/Damage. R remains as it has, a giant global heal. Unlike today, it was a flat amount with incredibly strong ratio
Over time: W is reworked into a large, instant giant heal nuke. The amount it healed for and it's AP ratio change often With the Support overhaul to give Supports Scaling AP ratios on their utility, Soraka's Heal is nerfed in base, and now grants armor. (this is where Lulu kind of got broken as all hell)
Later, Soraka's First major Rework takes place, making Soraka the banana slinging Healer we know and love* today.
Coming up/ on the PBE: Soraka's 5th? (I've lost track of her minor reworks) minor overhaul Q: Now is a tiny (Think Syndra Q) AoE that has a minor slow and pitiful damage and AP ratio on it. Now grants a buff that restores Health and Mana over 5 seconds. W: Massively reduced base heal amount because her Q buff that she gets for landing Q can now be given to her ally. E, R: remain unchanged
Soraka's gone through more changes to her kit than any other champion in the game. Her E alone has gone through numerous changes. First it was able to be cast on self or allies to grant a flat amount of mana. Soraka got twice as much if she cast it on herself. That was nerfed so she only got the same amount as if she cast it on allies. Then self casting was removed entirely. Then they made the mana restore scale with Soraka's own mana. Then they completely removed her E and replaced with her AoE Silence field (Which still has a .25 second update timer for measuring if someones in the zone so people can still flash and cast spells in it if they do it quick enough)
Riot let's have a conversation about how "Healing" in general is considered in this game.
HEALING League of Legends is a game where the primary objective is to destroy the enemy Nexus. pretty straight forward. However, you attempt this why simultaneously defending your own Nexus. The easiest way to defend, while also gaining a window to attack, is to kill your opponents. So, in this manner, Killing opponents, is considered a "Secondary Objective"
Naturally, Things that Delay or negate these primary or secondary objectives are frustrating to play against. Fortify back in seasons 1-3, Soraka, Mundo Ult, Revive.
Nobody likes to play against unkillable structures or champions. While Soraka herself is not unkillable, her entire design is meant to literally STOP the secondary objective of killing the enemy team, impossible. As such, she's going to be one of the most frustrating champions to play against.
In the past, Grievous wounds has acted as a reasonable countermeasure to Soraka by negating her healing ability. However, when Grievous wounds was reworked for pre-season 6, Soraka instantly became one of the most OP champions in League of legends essentially overnight.
Riot, as you go through attempting to "Change" soraka, You'll find that Having a pure healer in League of Legends will never be considered "Healthy" in a way players will accept. Because the Secondary Objective, is to kill opponents (And it feels rewarding to do so), Soraka, by her very nature, will be considered "Cancer", "Broken", "OP", "Annoying" and such simply because she stops the Secondary Objective from occurring.
What Can Be Done If you want to make it so that Soraka can exist in a healthy manner, You only need to provide a way to play against her heals. Right now the only option is "Blow up Soraka". Every rework you do in Season 6 with the reworked Grievous wounds will simply have the same issues: Soraka's good? Permabanned in Soloqueue; Soraka's weak? Unplayed and you get raged at for playing her.
The best solution is to add a new upgrade to Executioner's Calling, and an alternative to Morellonomicon
Behold: "Torturer's Serrated Blade" Build: Executioner's calling + Serrated Dirk + 600 gold = 2500 Stats: +40 AD +10 Armor Pen
Unique Passive: Unclosable Wounds - Basic attacks and Physical damage inflict "Severe Wounds" to the target for 3 seconds
Severe Wounds - Severe wounds reduces all regenerative effects to the target by 40%. This includes self healing, Health regeneration, and outside heals
"Book of Plague" Build: Fiendish Codex + Forbidden Idol + Amp Tome + 615 gold = 2400 Stats: +70 AP +100% Base Mana Regen +20% Cool Down Reduction
Unique Passive: "Infliction" - Inflicts "Incurable Disease" to targets that take magic damage while below 40% HP. "Incurable Disease" causes all outside healing to the target to be reduced by 50%
(Note: The Unique Passive Of Morellonomicon would now be named "Infliction" to prevent people from just stacking both items for cheap 150 AP, 200% Mana Regen, capped CDR, and the ability to block all healing by 40%. It would make people choose between the two)
Let's look at what these items do. "TSB" would allow an AD champion to counter Teams that have loads of regeneration from healers and self sustainers. This is in essence, a slightly weaker version of the old Grievous Wounds. BoP would force an AP champion to pick which Mana/CDR item they want. Grail for more defensive ability, Morellonomicon to handle self healers, or Book of Plague to deal with Support healers like Raka, Nami, Sona, Taric, Janna.
Overall, this would actually reduce the frustration people have with Raka, as they now have more options other than "Wait for Raka to use all her HP healing her allies then blow her up"
Please, consider other options other than simply overhauling Soraka for the umpteenth time.
*I know people love to hate soraka.
Also, Threads by me on the PBE that have some upvotes, people agreeing with my analysis of the current iteration of Soraka on the PBE: http://boards.pbe.leagueoflegends.com/en/c/champions-gameplay-feedback/hixpVPZu-actual-feedback-on-soraka