The rank up materials in Back Issues is aimed at 5* champs, so if you’ve cleared Act 6 there’s not much point. It’s a shame, some of them (not YOU Ultron) were pretty fun.
The back issues aren’t worth it anymore. They only give 5* shards and materials. Once you finish back 7, if act 8 is too hard, start exploring act 7. It’ll give you a bunch of 6*s and rank up resources.
Only play them if u wanna read the story from back in the day and do when nothing else in game as its still something but not worth unless u need 5 stars ranked up for something
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For now im saving up some resources to r4 6* before beat act 7