Archangel and Mysterio have now their ability accuracy reduced
It will happen when they are facing the new buffed Magneto(s).
It's a bug. Don't need to find a loop like "in the comic, they both will stand no chance against Magneto" just because this month we are focusing more on Mutants.
Otherwise, what's the use of "... ability accuracy cannot be reduced" in their description?
If you really wanna change Mysterio and Archangel (again) so that they will get affected by the new Magneto(s), compensation for all the rank up resources are needed and rank down tickets.
The community has invested in these 2 realising how useful they are, so if it continues as it is, this demand is not a big thing to ask.
Plus, AA and Mysterio could be useful counter somewhere in Act 6 against Magneto, but that will not work anymore will it not?