Majordomus Executus
The steward of Ragnaros is always up for chaos, especially since he is accompanied by 8 minions: 4 healers and elite fighters each. The melee fighters will be tanked, and the priests transformed into sheep. Since the healing adds can no longer be controlled once 4 minions have perished, the kill order is essential: First an elite, then the healers one by one, then the remaining elites.
Equally important: One player (usually the main tank) is teleported to the center of the area, causing the boss to run across the raid repeatedly. Moreover, the elites need to be tanked with distance due to their flame attacks. All tanks need healers.
Additionally, the minions protect themselves with colored shield effects, which reflect melee damage or bounce spells back. Careless players can literally kill themselves.
All of this gets easier after a few visits to MC. However, during the first visit, there is often a mess. Things go wrong during the pull, a mage accidentally turns himself into a sheep due to the reflection shield, an elite tank is out of range of his healer. Everyone needs to keep a clear head and listen to the raid leader’s instructions.