Nice video! So, I'll explain what you saw in your video...
At one point, Mystique couldn't morph back into her original self when she shape-shifted into a Doombot (per the Deception boost). That's because (as mentioned in the Read It file) it is best that once she morphs into someone, she should stay as that person until she morphs back into herself. "Play as one, stay as one." If you do multiple morphs during that time, she may not be able to morph back into her original skin. Plus, it could cause potential game problems.
You must really love that Vindicator mod to want to create custom skins for her. Too bad Malice isn't getting that attention... she really needs it. I am updating a lot of my older mods, so her damage output will likely increase. Be on the lookout for it, as hopefully that will get you to revisit her.
Marvel Future Fight has so many cool skins that are out. Skins like Stryfe, Psylocke disassembled (with the lighter purple hair), Iceman, etc. Looking forward to seeing what you and UltraMegaMagnus will bring -- you two should team up. I am certain that Small Pack 16 will be a good one -- keep up the great work.