I really, really doubt it works. No other trinkets of any kind work unless they somehow forgot that one.

The absorb works, but you're immune to the mana gain effect.

So far in 10 man, we have tried the following mana regen tricks

[Dark Rune] - Functional 15 min CD
[Lei of Lilies] - Functional shared CD with healthstones

Water Shield - Spell - World of Warcraft - Orbs functional, passive MP5 none functional

[Darkmoon Card: Illusion] - None functional
[Runic Mana Injector] - None functional
Life Tap - Spell - World of Warcraft - None functional

Lifebloom - Functional

Your theory doesn't explain shamanistic rage and judged wisdom, however. My best theory is simply that things were set to return mana if they would otherwise completely bork certain raiders. As you say, though, they probably forgot about Runes and Leis, as they're old relatively forgettable.

The nice thing about Lifebloom is that it's the cheapest heal aside from judged light. On the downside, it's not something I use frequently - I might bloom a ranged who had a bad crash experience, but that's not supposed to normally happen. I could bloom the tank (may as well), but only the HoT is what I would call reliable, and it's eclipsed by the other healing coming in.

Obviously enhancement shaman and ret paladins were meant to function in the same way other melee do on this fight, ie not having to worry about their power bar. It'd be a bit messed up if we were having to run around worrying about taking vapour ticks without having any sort of damage benefit to offset the lost time (and it'd just result in people bringing other classes). This discussion seems a bit pointless anyway, obviously it's intended that healers have to deal with mana in a different way in this fight and looking for ways to circumvent that seems to be against the intent of the fight.

Tree druids with spark of hope auto-attacking vezax with the "no-kite" strategy for omen of clarity procs is pretty hilariously effective. Between this and disc PW:S with spark of hope inside shadow crash pools, the fight (even hard-mode) becomes one of the easiest in the zone on 10man. I imagine it translates into 25man as well, but we have a pretty relaxed 25man raid schedule (currently 2 days a week) so we haven't bothered with the hard mode there.

Shields aren't heals so they're not affected, however they're spells so they get the mana reduction, which combined with the priest talents(Rapture I think it's called?) makes shielding pretty much free/giving back mana. Can step out to Penance and step back in for shields.

Rapture's self mana return does not work on this fight (yay Immune!). I can't speak to the "energize" effect on the person being shielded though.

That said, running into the Shadow Crashes for PW: Shield is still really really nice. Doing that shifted the fight from painful to simply unfun.

delete please, unsure of my data, I'll have to do more testing for improved soul leech since my recount is deceiving, I'll have to run a wws our next hard mode kill.

3 in 10 man
10 in 25 man