Laura Kinney leads the X-Men

Laura goes full mama bear and fights to defend her sister's friends. Squared Off + M (Bonus if you have Uncanny X-Men in play) is my favourite combo to pull off. I get a free ally that has a pretty beefy health pool and her stats work for either fighting or thwarting. Allies will help to either soak or to literally heal Laura (Noble Sacrifice) so that she can keep using her claws. Ready to Rumble will help to counter her obligation and keep her topped up on health when she flips down to do some alter-ego actions. Flipping down is still semi-frequent in order to benefit from her Alter-ego action (returning Gabby to her deck) and to heal/replay allies from Med Lab.

This is a jack of all trades deck. If more thwarting is needed feel free to remove Gentle and Havok for more thwart friendly allies like Mirage and Phoenix. Laura should be doing most of the attacks, but Cyclops is a good combo if you need to blitz down the boss's health more. If you want more on play allies (such as Mirage and Phoenix) remove the advanced suits and replace them with Mutant Mayhem. With Children of the Atom any allies will be able to retrigger their on play actions and heal up/reactivate. If you can never find Children of the Atom, add in Build Support side scheme, but I caution against removing Superpower Training as her identity specific upgrades are rather key to her survival. Finally, if you hate the extra two cards above the minimum, remove Noble Sacrifice. It fits the deck the least since many of the upgrades increase allies health but this card only cares about printed health. I included Noble Sacrifice because it has her on the art and I wanted to try it in this deck.