Mephisto vs. Proffessor X, Magneto, Sinister, and Jean Grey

What if they were all sent to Mephistos layer and had to work together and use their powers to fight off Mephisto? who wins?

well i say mags and professor bites the dust and this causes jean to go insane for the lost of her mentor. and goes DARK PHOENIX on his @$$ cosmic chick style oh and she just kills sinister for GOOD so that he can stop harassing her about her and scott's dna.

Wow this is pretty old but someone recently said something.

jean w/pf ftw