There is no cheat to magik’s limbo, nuke her down as fast as possible… however some options that can ignore it partially or completely can be ghost with hood( completely), unawakened kitty (80%), some other champs like guardian at high sig has high energy resistance.I found shang chi to take the champion boss the most easily, just bulid up around 25-40 charges then a single sp2 will push him to the last phase .Other than that Doom, sorcerer can take the champion boss easily. Just make sure you know his phases. Symbiote supreme with 200% boost can nuke him easily with sp3 then follow up sp2s.Rest you can make your team as you want as per each fight.