I did this at 79 on normal and the tactic was well described on wowwiki but its removed for some reason.

It was quite easy when i just got the gear so i guess its pretty much the same case with heroic, but its never easy with just a few epics!

Now the imba thing on this fight with 4 shamans is that water shield keeps you from going oom since it pretty much goes off when its not on cooldown.

I spammed chain heal ALOT with 4 elemental shamans and i never managed to go oom!