High King MaulgarFollow

I've been doing some reading and found that the fight in Gruul's Lair against High King Maulgar needs a mage tank! As my guild nears closer to fighting Maulgar, we will obviously require a "mage tank." How much health, mana, spell hit rating, etc... will I need in order to effectively tank Krosh Firehand? Also,what sort of strategy should I use while tanking him? Thanks to anyone who responds.