As someone who has argued about this previously I can say this: It’s doable, but holy moly is it luck based.
PHASE 1:
First, you HAVE TO leap the first ice barrier (jump first, then leap). No matter what. This needs to be done in order to CD it for the third barrier. The second barrier needs to be broken by bladestorming in avatar with ignore pain and rallying cry. AND THIS IS WHERE THE LUCK BEGINS: IF Xilem is on the platform directly opposite of you - you are done. You cannot charge him as this means certain death from the eye, while going around THE ENTIRE PLATFORM is a guaranteed slow death sentence. IF Xilem teleprots to a platform that is adjecent, you are lucky and you can charge him with victory rush and heal up. Continue to beat him sensless. After 3 barriers phase 2 usually starts if you dps adequately.
PHASE 2:
You better beg Yogg to give you crits because you are going to need them. Phase 2 is when Xilem becomes invisible and leaves many copies around. You are getting damaged and the copies are casting bounceback spells. you need to find Xilem, using safezones the adds leave their death to heal. In reality, YOU MUST GET TO XILEM IN 2 CHARGES, darting from copy to copy. Truth is - the copies are too beefy, so good luck killing them. I know my 225 ilvl warrior with full enchants, good trinkets and pots barely can, so any and all of you saying it isn’t broken can go somewhere else. Now, once you find him and damage him, he becomes visible with 1 of the 2 possible modes: arcane mode or frost mode. If you used your leap and he is in frost mode - good luck next try. If you accidently kicked anything other than channel power on arcane mode - good luck next try.
PHASE 3:
Pure dps race with adds mechanic. Keep the void thing close the edge of the platforms slowly and gently kiting him as he leaves pools behind him, leap away and stay as far away when he channels at you as 3 adds will appear. You need to kill the adds before they reach him or wipe, basically. If you didn’t kill the thing before the platform got completely covered in pools - good luck next try.
Also, to Ishayo, the video you sent me shows all of this in detail, especially the titanic amounts of luck the guy had in the first and third phase with his procs. Yes, It’s doable, it’s just insanely luck based. I mean, good right? We all love ourselves a luck based challenge where your skill can be nullified by rng, correct? In all fairness, I believe some challenges are more/less broken then others. Druid ones are just shattered at this point though, no denying it.
P.S.
The reason why Legion MT was good was because it was a challenge that allowed you to make minor mistakes. Even before the overgearing during 7.3. you could allow yourself one small mistake and bounce back, because noone is perfect. Hell, even after 7.3, with the overgear, Magetower was still a challenge. Definately easier, but nowhere near as “steamroll” as many would suggest. This is what made it good, the fact that you knew that it was hard, but it was fair. It allowed you room to breathe and figure out your mistakes, it allowed you chances to bounce back from them and turn the tide back at your favour. This MT does not do that. This MT is a non-stop pain train from start to finish and you bet it has no brakes. Some people love this kind of stuff, but they are not even the 1%, they are the 0,1%. And if the devs will only cater to 0,1% - the game will die. Like I said, the game design shouold sit at a comfortable middle, where tryhards can have thier little community contests, the low-skilled players are elevated by the community and the game to strive for better and learn from their mistakes, while regular players understand that while some of the content may be difficult, it WAS made for them, it IS possible, and it IS fair, all you need to do is practice and belive in your skill (Not even remotely anything even near this has been released by Blizzard in the 2 expansions after Legion).
looks like you dont like hardmode content.