[{quoted}](name=Frozen Sovereign,realm=NA,application-id=3ErqAdtq,discussion-id=iE8Gjkmu,comment-id=0002000000000000,timestamp=2016-04-13T09:41:36.191+0000)
The idea for Wish applying Rejuvenation is neat. I like it a lot. But Rejuvenation making targets immune to GW for the duration would be too powerful. It'd defeat the purpose of buying Executioner's Calling, Mortal Reminder, Morello's, and taking Ignite, when she can allow targets to be immune and constantly refresh the immunity should she continue to land Starcall. Which would not only empower her healing, but also empower her ally's self-healing, be it their own kit, Bloodthirster, Heal, etc.
Well think about it, it can only be applied to one target at a time. Keeping that in mind, lets look at Bronze and Silver players, a Soraka player at this tier will not be utilizing Rejuvenation effectively. At the same time, no one would be buying Executioners calling anyway, they didn't before and they won't now. So this effect on the majority of the games population would be balanced and in the majority of cases, just downright useless. However, a player that knows how to utilize an Executioners, or Morello would be displaying a level of knowledge higher than average player. On the same coin a Soraka player knowing how to minimize the effectiveness of GW would be showing qualities of higher elo play.
Now looking at Gold to Plat, you can expect people to be purchasing GW consistently, you can also expect that a Soraka player will be able to position well, and manage her Rejuvenation heals better. Also keep in mind that Rejuvenation only lasts for 4 seconds, and Mortal Reminder applies it for 5 seconds. Treating it as immunity to the effect of GW, not the application, if Soraka were to change her healing focus, it would leave an ally vulnerable. Which in turn could give the enemy team opportunities to take advantage of a Soraka changing targets. Or missing a Starfall (Q) as she won't be pumping out any Rejuvenation heals for at most 5 seconds. Also, since her healing is focused more on Rejuv, it will require Soraka to build more AP than she needs to currently, since her base scaling on heals won't be as high/bursty with minimal AP. Forcing her to delay tanky items, and in general be less tanky. And this will become one of her weaknesses as being less tanky will leave her more open to being dove and killed. A tactic that higher elo players are proficient at.
Also, GW immunity does NOT prevent someone from being bursted, and with Rejuv focused healing, a Soraka would not be able to out heal, say, an assassin's burst on their ADC.
tl;dr
Soraka's balance will be determined at each level of elo. Bronze players that don't manage Rejuvenation well, can still do fine as it is less likely to be a mistake that the enemy will capitalize on, where counter-play would be GW. Diamond players however, will be able to capitalize on and take advantage of Soraka's mistakes, making counter-play advantageous, or focusing the Soraka. Forcing the Soraka player to manage her Rejuvenation correctly, as well as knowing which ally will need the GW immunity, while keeping herself at a safe distance. This creates a skill curve that follows the progression of skill within the game, which create an exceedingly well balanced champion. An example of this would be Azir, or Kindred. :)