Killed this guy last reset. I'd dread doing this fight with less than 5 priests. For sure, 3 priests is enough to dispel everyone, but the amount of healing I was able to do when I stopped Mass Dispelling my group nearly doubled.
We found HOT classes best suited to raid healing. The aura ticks at 1000 per 3s. Most druids rejuvs will tick at > 1000. My renew ticks at 920+ per 3s. A nice advantage of this was that we didn't have to depend on people being in any particular place - so we were able to have good spreading along 4 sides. We took 8 healers.
The other advantage was that encapsulated groups still received some healing (from HoTs) as they were moving. Improved spreading greatly reduced encaps issues, and having 2 CoH priests able to spam whoever got an aggro warning generally kept people alive until the other healers were able to join. Shortfalls were generally covered by a nice timed PoH or by chucking a CoH/ProM/extra HOTs to another lower HP group. Very enjoyable fight for me as a healer.
Our tacs are particularly shaman unfriendly, and probably could be much improved with some timed huddling. We did consider using some arcane resistance (Violet Badge) but people were unwilling to lose the DPS. Our WWS is @
Wow Web Stats and might be said to be ridiculous for the raid stacking we used.
Couldn't imagine doing this fight without a Protadin. Ours is usually Holy and respecs for the fight - blues/Karazhan/Badge/BT gear mix - about 16k HP raid buffed - so pretty low requirement. Our other paladins healed with Righteous Fury to help control where the skeletons spawned from.