The surprise factor should work wonders at first- Nightcrawler caught Magneto off guard, and once they have Magneto, well, the heavy hitter ratio begins to shift and taking on the likes of Vision isn't too hard. Kitty's really good for ambushes too.


Also strikes me that 'Curse of the Mutant' has the vampires trying a similar plot. Get the mutants, and a whole lot of vampmutants is a really hard force to stop.