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Need advice relating to the new event quest

Here's a back story I recently became uncollected and decided to go for the UC difficulty quest. Everything was fine until I bumped into red hulk boss, I did manage to take him down with my Electra by just throwing a few hits and then quiting the fight and I don't really want to go through the same route. Would really be thankful if anyone can point out a few counters.
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5*hela rank 3
5*Angela rank 2
5*Electra rank 2
5*colossus rank 2
5*Hulkbuster rank 2
5*mordo rank 1
5* mag rank 1
5* Cyclops rank 1
5* Kamala khan rank 1
5*storm rank 1
5*Ultron rank 2
4*vodoo rank 4
4*capiw rank 3
Other 4* all below rank 2
Guillotine duped
Human torch
Ghost
Ghost rider
Iron fist duped
Vision aou
Storm
Namor
champion
Quake
Gamora
Nebula
Rocket
Og BP
Rulk
Hood
Black bolt
Punisher 2099
Starlord
Bishop
X23
Sabertooth
Groot
Ronin
Yondu
Loki
And finally mighty groot
Would guillotine work
I knw my roster is awful and I did play this game a few years back but then sold all my champs coz I had enough with this game and had to focus on my exams bad decisions were made😅😅😅
Ps for some reason could not attach screenshots had to write it all down
You can also dex with Elektra while he is bleeding as she has aar.
Oddly, you could also try storm and mags with the above 2.
Storm, save for an sp2, don't dex, hit him with the sp2 and hope for the stun then hammer on him without dodging (but still block!) until his block damage kills you. Try to get another sp2.
Mags has heal block on his sp2, so again save up, then hit him with it.
Both don't naturally have buffs, so again so long as you don't dex, he won't heal.