Soraka feels unfun to play against
I'm pretty sure I'm not the only one who thinks a 300HP heal on a 1 second cooldpwn is cancer to deal with, her R just autowins teamfights because of the sheer amount of healing and grievous wounds doesn't do enough.
My suggestion is to buff grievous wounds or nerf her healing
This build has 40% CDR and dishes out over 300 healing on less than a 1.5 second cooldown. It also has 3k health and warmogs makes the health cost on W mean nothing.