I'm not playing much atm, didn't even get my weekly chest last week, and failed to refresh my artifact research in time...
Anyway here is the video which I started editing a few weeks ago
This was my first time doing this dungeon on mythic+ with my hunters.
Regardless of the team, Serpentrix will probably always be the toughest boss.
Since 5 dps just can't simply nuke down the boss quickly because of the submerges, we must be able to survive a while without a healer. Most dmg can be avoided while moving, so this suits BM hunter perfectly.
I chose to kill 1 add then just focus on boss. Best would probably to kill both of the first 2, and then just nuke the boss on the second submerge. With the self heal and turtle shell, it is just about enough healing to manage this fight.
King Deepbeard is also quite challenging. Most Important is to spread out during the quake. If you don't, you will die. So before every quake, always spread. Even if it means that some character is out of range, or even standing in his stomp AoE.
The rest of the bosses are easy.