I run

Prot pally
resto druid
2 X arcane mage
Ele shammy

I put all my guys in a box formation in the exit cave. I put my paladin with his back to the corner, so the knockback doesn't do anything. I DO NOT MOVE AT ALL ON ANY TOONS. I wear my frost resist gear, and simply smash my big button. I basically main play my healer, and heal people through targeting, frosts, etc. I stop healing when my healer gets the brand. If someone else gets the brand, I simply turn them around so they can't cast. It can be some crazy healing, but this seems to work best for me, and I only wiped the very first day when I was figuring out the fight.