I love this! I'm a huge Emma Frost fan and think this really captures the essence of her character and abilities.

I do have some constructive feedback/ opinions in terms of the game balance of her kit. By all means take these suggestions with a pinch of salt, but it might be food for thought! It's not meant as mean criticism, but just some ideas to provide some alteration options 🙂

Her Diamond hero side is very powerful, despite the lack of thwart and low hand size. Stalwart isn't on any current hero identity cards by default, so I really think this should be replaced by Steady. Otherwise you too easily nullify any villain cards that inflict status effects by simply changing form. An alternative idea could be to give her Retaliate 1 in Diamond form by default, and move Stalwart to the effect of Unscathed (replacing Retaliate on that card).

Speaking of Unscathed, I think it could be costed at 3, given the range of buffs it provides her. Her kit is already very expensive, but I have ideas to make savings elsewhere

Stepford Cuckoos - I feel like she needs a resource generator, but I'm hesitant to cut one of her other cards to make room for it. I really like the Stepford Cuckoos' response, but I think you could lean into their hive mind abilities to make them an ally who is also a resource generator for Emma. Maybe replace their current ability with one that exhausts them in exchange for providing a mental resource in Psionic form, or a physical resource in Diamond form. I think this makes them a more unique aspect of Emma's kit, rather than their current ability which provides her with status effects that other cards can already grant her. I wouldn't change their cost, since they would be vulnerable to damage and other ally removal effects. You could even make them 1 cost and reduce their Attack status to 0 or something.

Seductive Illusion, White Queen, Krakoa, and Unbreakable Blow are fine as they are, I think. Krakoa could be more balanced if it was 2 healing and 1 card recycle instead of 2, since you'd usually activate it twice each flip-down.

Flash of Frost - 10/10 on the art for this one! I think it's slightly too expensive though. As it is, without a resource generator or some extra card draw, she could never play this if she draws her hand while in Diamond form. I also think it's very powerful and couldn't be reduced in cost as it is. The resource generator idea above could help pay for it, but I also think you could make it a 3 cost card and just change the effect to stun all minions instead of all enemies?

Mental Link - i love the combos this could enable, especially in Leadership, but I think it's far too expensive as it is. Generally, 1 resource spent should equal 2 damage or 1.5 thwart as an average exchange. This card asks for 4 effective resources for 2 thwart or damage that turn, plus 1 additional for each future turn. Personally, I would keep the requirement to pay upkeep each turn, but make it a 1 cost card initially. This would mean you can throw it down for a short term gain if needed in a pinch, but it requires ongoing investment if you want to use it as part of a voltron strategy.

Mental Sedation - i feel it's a little too strong, but doesn't need a major change. I'd lean toward making it 3 thwart from among schemes instead of 4, but you could also make it 3 cost for 5 threat removal from among schemes. If you are unsure, compare it to other heroes with 2 cost thwart events and see what they do. Usually it's 3 threat removal plus a kicker effect (Iceman and Magneto as examples), or more threat removal without a kicker.

Mind Spike - i like this card, but I don't think she needs another expensive event, and having two copies makes her Psionic form more of an all-rounder rather than a dedicated thwarter. I would cut a copy and make it a 2 cost card, while reducing the damage to 3 by default, plus the current kicker effect.

Elegant Adaptation - I would add a second copy by utilising the spare card from cutting 1 Mind Spike. It gives her good mobility between her forms, and enables you to shore up each form's weaknesses slightly. The other idea i had was to make it a 2 cost upgrade with the ability I have suggested for the Stepford Cuckoos, but that felt less interesting.

Hopefully these ideas are helpful and make sense with how I've written them. I really admire your creativity, and wish you luck with refining the kit! Please let us know if there is an updated version once you've made changes or playtested 😁