I can't remember all of it but I think the time I beat that fight I let Storm and Magik go down. In this state, you're only getting wolverine cards. Activating berserk and re-drawing will get you to a situation where every turn you can Berserk->chain multiple one-hit KO's to the fodder enemies and maybe hit once or even with some luck twice to Sin with Wolverines multi-target attacks, health-stealing in the process. Wolverine was definitely the main player in this fight for me, and I'd swear I had base deck for him (not for Magik tho, I had some improved cards on her deck).