I actually specified no phasing - since she's only ever been shown doing it once. But her damage soak/healing factor should suffice anyway.
Also (I know this is really late but) I thought I'd address this:
Originally posted by Scoobless
I really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, really, HATE all these mutant upgrades!
........really!
Mutants are supposed to have full access to their powers by their twenties.... Mystique is probably like a hundred years old.... why is she just now discovering new powers???
Mystique served to complete the circuit of a machine designed to heal Toad, the energies of the machine however caused molecular liquefaction. Her body compensated for said liquefaction, and subsequently her powers have been slightly hightened.
Additionally she had a 24 issue solo title - any character that has a solo title is inevitably going to accumulate more feats than if they were in a team book. It's not so much that she's gained any new powers - aside from the one phasing incident - all she's done is used her original power in more interesting ways.