[hi1hi1hi1hi1]

Is Telepathic Sedation part of her normal attack, or her special attack, or both? I would change the wording a tad bit:

"If Emma Frost inflicts a wound on a Unique Hero (with her normal attack?), roll the 20-sided die. If you roll a 13 or higher, you may remove one unrevealed Order Marker from the wounded figure's Army Card."

The only thing I don't love is that there's never a reason for Emma to use her normal attack. It's got a lower range, lower attack, and as worded both attacks are still subject to Psionic Force Blast.

As for cost, I don't think 140 is too that low, her defense is only a 3 which gets torn apart pretty fast in high point games even with the X Marker saving her once a round. Maybe 150, it's hard to tell without playing once or twice.