Mystique / Wong / Spectrum = live the dream. As many early on-going drops as you can. Mystique and Wong have no synergy with anything else, so you have to hit or you lose.
To add back up plans, consider strong on-reveals like Hazmat (Luke Cage synergy!), Ironheart (3:12/24), White Tiger (5:15/29), Dr Doom (6:25/45), Leader (6:?).