I know what you're thinking. You probably think that I'm crazy for passing up on Magneto. But there is a valid reason for that.
That is that the Guardians of the Galaxy have been irrelevant in this game for years. Just a year ago Gamora was buffed but they still are. The last GotG champ came out in 2017. Star Lord has lost his value, Rocket doesn't have any utility, and Groot is still Groot (trash).
The next movie for the GotG comes out in 2 or 3 more years and there isn't much to add from the comics. If these two champion are reworked... then we can see more GotG teams used. Cmon now... I know we all have most of em at high rarities.
I'd imagine they would have some sort of synergy if they are all present on the team. They are a family like the F4 and are inseperable. Not to mention they already have 60% perfect block w/Agent Venom. These two reworks could greatly improve Drax through synergies and possibly Star Lord's utility as well.
The Tech class is also in need of another useable champion as it is falling behind... really was falling behind this whole time. The mutant class just got Storm X who seems like a very good champion so buffing Magneto will just overpower the class right now. Cosmic's reign has been slowing down with the last 5 releases and they probably have the most disappointments out of any other class.
Rocket and Groot are also very old. Rocket came before Magneto and Groot came just months after and is arguably worse. This pairing for the next reworks just makes the most sense to me. I just hope Kabam considers buffing 2 this time.