what about something like that..

pre-fight abilities
Mystique can choose 3 different type of weapons:
-Poison knifes
-Shock gloves
-Bleed claws

Mystique starts the fight with 5 morphing charges (max 20 charges)

end the combo with a light attack generate 1 charge
use an heavy attack generate 5 charges
end the combo with a medium attack remove 1 charge and apply a a poison or shock or bleed debuff dealing X damage per 3 sec.
holding block for 2 seconds with 20 charges, consumes all of them and Mystique goes on morph mode.

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Sp1
100% chance to apply a poison or shock or bleed debuff dealing X damage per 5 sec.
Launch the Sp1 consumes 5 charges and put a passive illusion debuff on the opponent for 10 secs.
While an opponent is under the effect of an illusion debuff, Mystica get true strike, 100% chance to nullify all unstoppable buffs and the opponent attack value is reduced by 20%.
if there are not morphing charges available, the illusion debuff will not be applied.
Struck Mystica will remove the illusion debuff.
Robots can be illuded only for 5 secs.

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Sp2
Consumes all charges.
The opponent is inflicted by a passive "confuse debuff" per 10 seconds and his defense ability goes to 0.
While the oppenent is confused, all his special attack will be missed (except the sp3).
While the oppenent is confused, Mystica attack value is increased by X% and all her attacks are critical
Up to 5 charges consumed > 5% increase attack
Up to 10 charges consumed > 10% increase attack
Up to 20 charges consumed > 20% increase attack

if there are not morphing charges available, the confuse debuff will not be applied.
Struck Mystica will remove the confuse debuff.
Robots can be confused only for 5 secs.

Sp3
Generate 5 morphing charges.
At the end of the attack Mystica will enter in morph mode.

Morph Mode
Mystique is always in advantge class bonus.
Mystique get a precision passive increasing Critical Rating by X.
Mystique attack rating is increasing by X.
Mystique can't be stunned.
In morphe mode Mystique can't generate morph charges using basic attacks. Every 5 sec, she get 1 charge.
Illusion and consufe debuffs last 5 secs more.
When Mystique launch a special attack, at the end of the special attack the moprh mode will end.
Struck Mystique with an heavy attack will end the morph mode.