Do you have Symbiote Supreme? Him and awakened Morningstar are some of the best options
Ramped ms is a great counter. If you have some points in md, even better - can spam sp2 for days. May want to wait them nerfing act 6. You are already cavalier, and going further doesn't really make any difference.Also r4 5* is good enough for the champ, took him down with r3 sym supreme and r4 shehulk. I'd prefer to rank up 6* ghost or sunspot. Looks like your 6* luck is insane!