I can tell you what I personally did however I don't remember what power I had and it did take a bit of luck with the power that I did have.
I tried a bunch of things and at the time the thing that worked was Sage Naruto, Normal 3* Gaara, Mabui and Wind Main.
SN - Gaara - SN Clone
Wind Main - X -X
Mabui -X - X
I had Wind Main mystery as Blind. Don't remember standard. Passives are a bit iffy because I don't remember what worked in the end or how they changed her in 3.0 but I was playing around with Blind round 1 passive so that it blinds Jigo and Gaki and other times I used clones to soak up dmg however I think I somehow used both but that could just be memory problems anyway I would recommend trying to blind.
I don't remember who I blinded with Mys, you can figure that out when you see their atk patterns.
Oh and I think I used Enhance Wind passive for 40% boost.
Round 1 launch the barrier because you're gonna want to nuke asap.
Round 2 wait for gaara. I'm pretty sure at this point you need SN to give chakra in the 2nd spot then you can nuke. I believe I nuked whoever was at the bottom. After you observe your dmg you can decide who you need to focus. Soon after I think you should be able to use both SN to finish off a couple more pains and maybe use Mabui too. Shurado with his interrupt can be annoying and I think you might have to just tank his mys with mabui.
Round 3 I really don't remember much at this point, most should be dead or have enough HP to just standard hit and kill them. Pick whoever you want to atk with wind mains mys if it is available.
This is what I roughly remember doing.
It took a bit of luck with the blinding and timing atks on them but this was very promising when I thought about continuously nuking them.
If you can't get to roughly what happened in round 3 after many tries then you probably don't have enough power to luck this yet.
Hope this helps at all.

That blue circle becomes easier the higher your level. At level 82 you won't beat it with less than 55-60k power, but the same circle is easy beatable with 43k power at level 88. if you can't beat it now just wait to reach level 86-87 and retry. Personally speaking i beat it in 2.0 with mei mabui tenten gnw azure fang lineup at level 87 with 45k power (at the time there was no charms and many less power ups).

Dude That helped a Bunch despite me not listening to much of it

( Sorry by the way, but i needed to go to bed Quickly at the Time )

i only lost 2 people but Gaara Wiped out Most of Them

( Not to mention the other Last Fights Gaara literally Destroyed the rest of their 30k-40k hp, Granted also boosted him to Red, 3 stars and Cultivated Max )

But Him and Sage Naruto are Total Beasts

That was one of my biggest Struggles and Thanks to you i got 90 Coupons

( Honestly if i never beat That ever i would Cry, on the inside of course )

Anyway

Thanks so Much

When i beat it i Used Emperor Ziel's Strategy and granted since i tried maxing each ninja and had only 41k Power

It Really Helped