Maybe I missed it, but had nobody thought about Carol, Star Lord and Coulson? I'm playing with a Champed Carol and Star Lord and a level 70 Coulson and I'm wrecking everybody and everything. Covers the full rainbow and with the boosted Carol I'm quickly getting strike tiles that add 10k damage.
Just champed her in the Sinister Six event, and get to play with her boosted in DPvMPQ.Good gracious, she's a monster. Get black out, and it's virtually game over with the fortification on the CD tile. Bring any other special generator or CD generator and things go nuts, fast. No wonder everybody runs her in PVP these days. If only my Coulson were farther along...
Of course, there are better options in 4* land, but you don't have them champed yet.