First thing I'd like to clear out is that I'm a noob shaman, never really played the class (had 30something shammie on Badlands on live), nor do I claim to "know" the class. Creating new topic not to disrupt shammie class discussion in other one.
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This build is not a new one, it's been taught to me by my old RP mate on live. Relies heavily on heal crit and utilising shaman 5/5 mechanic making it nearly impossible to run out of APs (if anything it'll give you enough to share them with any ally you see) and keep insta-cast ready plus steady pulse of group heals (it works on nearby allies now?).
Tested it in scenarios, orvr and keep sieges over this weekend. It works. Impossible to go below 70APs unless you get drained by AMs. Feel free to test it

Build:
Spoiler: