Prince Malchezaar is a 3 phase fight, ranged will stay at range.
The MT should have Shadow protection on.

Encounter

Phase 1

When Malchezaar is agro’ed our MT will pull position his back to the wall allowing the Prince’s back to be in view of the raid. He will enfeeble 5 random people excluding whoever has his agro for 7 seconds, brining their max health to 1 and can not be healed, anyone afflicted by enfeeble should immediately stop what they are doing and run away. Malchezaar will cast a 3 second long cast, Shadow Nova right after; it hits for about 3500 shadow damage and has a knock back effect. After the enfeeble wears off the player’s health will return to normal. At 60% health phase 2 begins.

Phase 2

Malchezaar will dual wield his axes and greatly increase his melee damage. In this phase he gets a melee boost, he can now cleave and use sunder armor against the MT. At 30% health phase 3 will begin.

Phase 3

He will discontinue using Enfeeble and throw his axes, they will float around attacking players at random, and can deal damage quickly. Healers will need to watch everyone in this phase not just the MT.

Buffs

Amplify Magic on Main Tank
Shadow Protection on raid
Judgment of Wisdom on Prince

Positioning

Main Tank / Off Tank
Maintain agro Malchezaar

Melee DPS
DPS Malchezaar

Ranged DPS
DPS Malchezaar

Healers
Heals on MT, in phase 3 watch entire raid