Uhhh didn't you rework Soraka for a certain reason back then?
That reason mainly was: heal too strong, especially when it gives def stats.
Now you released a mastery that makes her heals stronger and gives them def stats on top of that...
Playing against that feels completly atrocious tbh. Who thought that this mastery was ever a good idea as long as Soraka exists? Like, seriously. Isn't there a checklist for internal testing that's like "in case of buffing heals keep a close eye on these champions"?
You really need to redo that mastery - or nerf raka. The shield part is fine, but buffed heals plus stats are completly over the top with raka right now ...