Change Malygos , not classes spells.

From the thread on the Malygos fight thread.

Q u o t e:
This is an excellent post and right on. GC has now shown he is out to nerf CoH and WG no matter what, and so he used this lame crutch to attempt to buttress his eagerness to nerf, and ignores the terrible design of the encounter.

ONLY INSTANT HEALS CAN BE USED - THIS IS DESIGN

And you are exactly right. When CoH and WG are nerfed into uselessness so there can be no one besides Shaman who can heal AoE raid damage, this fight still will only allow instant heals.
Which is not going to change it for Resto Shaman or Pallys, who still will not be able to heal it.

This needs to be repeated.

GC's reasoning that they have to nerf two classes before they can nerf the fight makes no sense.

Q u o t e:
The Malygos Vortex is the kind of thing we have to do to challenge AE healing because otherwise groups can pretty much trivialize it. This is one of the reasons we think Wild Growth and Circle of Healing need to be nerfed. If those spells aren't so powerful, then vortex and similar moments don't have to be so intense either and we'll be able to nerf it if needed.

Being in a fight where you have to heal or die does not change the fact that shamans and pallys can't heal there now and won't be able to heal unless the fight dynamics are changed. Blizzard has stated before that they wanted all healers to be granted an equal chance in all encounters. This is not a fight where they are keeping their word.