See that? That's what a completed Glory of the Raider achievement looks like.
See that? That's what a really ugly proto-drake looks like.
Up in the sky! It's a bird! It's a plane! No, it's... ugh, what the hell is that?
Tonight, I finished off my Glory of the Raider achievement with a 6-minute Malygos kill. A lot of my guildmates were all ready saved to Malygos-10, so I scrounged up a rag-tag group amongst the top 3 guilds on Malfurion Alliance-side. The group in the end up looking like this. It was more melee-heavy than I generally like for Malygos, and some of the group members would have been better off as different specs all buffs considered, but these guys know what they're doing, so I was confident enough.
After a quick explanation on how we would execute, we dove right in. The holy paladin we started with had to go after a few failed attempts, so our shadow priest swapped to holy and we brought in a boomkin. First shot with that group comp, we took phase 1 down in a blink, only allowing 1 vortex.
Here's what you do: have your DK watch the skies for the origination point of the first spark and call out its cardinal direction. After the first vortex, everyone but the tank moves toward that cardinal direction, and the tank goes the opposite way. For example, if the first spark is in the southwest, the tank goes northeast and faces Malygos that direction, and everyone else moves southwest and stacks on his tail. Heroism is blown, the first spark is killed. The DK then Death Grip's the next spark on top of the kill zone of the first spark. It gets killed as well, so now you've got Heroism and a double spark going. Pop your other DPS cooldowns and tear Malygos a new a$$. If he doesn't go down before he takes off for his second vortex, make sure you at least push him under 50% and keep DPS'ing so that phase 3 is shorter.
From there on out, it was just a matter of focusing fire and not messing up in phase 3. We let the 2 healers keep on healing in phase 3, moved left after every static field, and kept up our 1-1-2 rotations.
Now I may lord over the Dalaran landing pad on an ugly ugly mount! Woohoo! At least it flies fast.