We’ve all been asking for these modifiers for some time and with the introduction of supports, perhaps this is a good opportunity to implement them and utilise the characters that are hardly used in your roster.
For example:
starks industry
Only equip to Tony.
Rank 1 0.x modifier to iso earned
Rank 2 0.x modifier to XP earned
Rank 3 0.x modifier to red iso earned
Rank 4 0.x modifier to HP earned
Rank 5 0.x modifier to CP earned
Another ideas include modifiers to token % or bonus heroes (what support can represent increased luck in marvel?). It doesn’t have to be crazy, bonus heroes can probably be bumped to 8% (extra 3% at level 250 etc) would be enough.