Another one I use all the time is KK, IM-40 and She-Hulk, last event I went from 1400-2000 points with just this group and used 1 heal. It is very fast and denies, denies, denies. IF you like blue in Magic this is a combo worth trying. Just make sure that you have IM-40 max blue not red so you get maximum benefit of the AOE's which is your major source of damage.
So not much a whole combination rather than a pairing I am greatly enjoying.
Gamora & Iron Fist plus an under covered 4* Cyclops
Gamora is all about getting Bad Reputation out whilst using Cyclops as an additional battery. Iron Fist has that beautiful passive and generates black for Bad Rep.
I can usually get out two Bad Reps per match and then I use her cheap Red to slice into enemy health after I've used Iron's green of course.
Strike tiles everywhere!