You can’t even read properly. You said you did not want to spend a lot of golds and time and those are time and gold efficient method to get quick and cheap power up.
Also i specified “can” is not a must have.
The best defensive trinket is for sure a cheat Death one to get an extra annihilate cast.
Versatility is not a deal breaker in that challenge.
I tried with a high vers setup for the healer one but didnt work for me. Ended up using more mastery gear since the hp on the npc’s dropped so low. Did mean i lacked some damage in the last stage, but worth it to be able to heal the npc’s 
Here is the bottom line. You don’t need to farm specific gear to do it. People have done it with full SL gear. However if you are struggling on the last 10% you can either keep practicing or admit to yourself that you need a bit of gear to overcome it. There is no shame in that. There are players who got the Fel Bear before any nerfs was done. I couldn’t do it myself until the 10% nerfs came in and equipped some of the recommended gear.
As for your issues specifically I used Incarnation instead of galactic guardian because the 30% HP and 10 sec longer duration really helps and you can just use ironfur and nothing else for his first annihilation. Then barkskin 2nd, SI the 3rd and SI + barkskin 4th.
I’m also wondering if you are dumping your rage at random into ironfur or maul? Especially with incarnation up you should get full rage really fast and you can just sit on 100 rage so you have it ready for healing or ironfur. Use healing potion early if you need to top yourself and save orbs for later so you can delay his casts.
I agree that it’s a very difficult challenge and Blizzard missed the mark by making SL gear and consumables worse than old stuff, but at the same time people need to stop blaming everything except their own effort. If you are dying to the 3rd annihilate it’s not because you are lacking versatility, it’s because you are panicking and wasting cooldowns and rage too early against Kruul. I did the same myself many times.
Overcoming challenges with gear isn’t something new. The problem with the MT challenges in general is I think they are way harder than people expected and we don’t really know if it’s intended by Blizzard or not. And that they messed up the scaling so the stuff most people have now is worse than old gear.
But farming better gear for a CHALLANGE was always the case.
it’s not like they came up with this yesterday
And remember you are not playing a Skill based game
you are playing game where GEAR progresion is very important
your raid team will not beat last mythic boss with just a LFR/Normal gear
cause you will not have HP for certain mechanics and DMG for certain phases
you need to optimize
you need to think about what you gonna do
and that what’s makes this challange interesting
I will point out that vers+mastery, and having blood-splattered scale helps so much that if you stack it you can do it without using bear form.
https://youtu.be/5v-m60AmrUo
I am maybe going to try another challange than the healer one during the holidays. The healer MT is the only i have seen (also in legion) . So maybe i am interested in others to at least just see something else. I need to learn not to press alt + hotkey… all my damage buttons are on that on my healers, while the healing abilities are without modifier of course 
Potential specs are elemental or windwalker.
It is, as proven by countless others and videos.
As opposed to, you know. You.
Except they haven’t.
Deal breaker=/=helpful.
Again, you are so butthurt you can’t even read apparently.
The person sitting in boomkin stacking vers/mast had to do so because otherwise would have prolly missed the dps check.
Sitting in boomkin and closed 20 dps higher than me never using moonkin, go figure.
Look, as soon as you admit to yourself that it’s not only gear/consumables that is the factor here then I’m sure you will be able to overcome the challenge. As it stands now you have a few options.
1.Get gear and consumables to burn through the last 5-10%
2.Keep practicing. If you already have him below 10% on 3rd annihilate you can do it without more gear.
3.Stop playing and wait for nerfs.
This. But any excuse is a good enough excuse as long as they don’t have to consider the biggest factor for their failings, themselves.
I see nobody claiming they can not improve themselves.
It is funny watching people go “It’s all about how good you play…” but these people sure are not doing it at level 50 with unenchanted heirlooms and no consumes.
And you are?
Frost mage, yes. Anything else, probably not. But I’m also not the one claiming that it’s all just about ‘being good and doing the mechanics’. It’s heavily reliant on gear, enchants, and consumes. More so than it was in Legion. In fact, I’m stating that gear, enchants, and consumes matter way too much this time around and we should’ve gotten templates… Then all these people that claim it was ‘easy’ and all would’ve been on the same playing level for the ‘challenge’.
It is absolutely ridiculous to claim that you cannot do any of the challenges in base shadowlands gear. Is it harder than if you had 100% optimized timewalking gear with sockets, enchants and consumables? Sure. But what it comes down to at the end of the day is personal skill.
Funny side note. I saw a video on wowhead where someone beat the guardian druid mage tower challenge without using bear form.
No, but you are the one taking it to the exact opposite actually which is wrong as well.
No one said is doable naked, with no enchants or consumable “ez” but a lot of people also do not seem to accept that the biggest difference is also played by the person pressing the buttons.
Base SL gear is not excluding full versatility stacked 
None of my characters stacked any single stat nor did they have sockets out the wazoo for the challenges. Just what was on hand. And that is what I meant.
Furthermore, complaining about versatility stacking means that you cannot do it without. Which, in turn, means that you should do it to complete the challenge. It would be rather easy to go into old legion raids and grab all the versatility gear. Better than 100 wipes “for not having the right gear”, anyway.
Not at all, especially given this challenge is supposed to be doable on alts from the Legion era.
Neither did I.
In this case the biggest difference comes from gear, enchants, and consumes rather than ‘skill’ and ‘knowledge of mechanics’ I would know given so far on chars I beat it on release week/month in Legion with zero raid gear are having a way harder time.
Not to mention the changes of abilities and how things work, and the loss of Artifact trees, etc.
Another thing I’ll point out, that it’s harder the lower level you try it at. Because you get ability upgrades on your way to 60, and you get stam from your renown levels. ;3
It’s weird to me the people that say they want more challenging content do try to do all sorts of stuff to make it easier. Especially the ones claiming it’s all about who’s behind the keyboard.