If you're putting Jean Grey and Magneto on the team you're pretty much dooming the Justice League. Both of them are as powerful as many cosmic entities.
The X-Men fight as a team, if there are any individuals who will give them trouble it's Flash...as his power is somewhat unmatched it seems anywhere else.
When you speak of Cosmic entites you speak of characters like Galactus, The Celestials or The Living Tribunal. I'm a 100 percent sure that neither Jean Grey or Magneto is as powerful as them. Jean with the Phoenix force is so god awfully writen power wise and has been recton over and over that it's just to damn convoluted for the chracter to hold any real weight. The Living Tribunal is also the most powerful being in the Marvel Universe.
Magneto isn't a push over, but him against Superman is debatable. Jean having the Phoenix force shouldn't even be thrown in the mix, for christ sakes, magneto or whoever that was that was portraying magneto killed Jean when she had the Phoenix force or was the force.
 
				 
						
 
 
		 
 
		
 
 
		 
 
		 
 
		 Figures that OZONE would come here with his Storm loving rhetoric and non-sense views of "science" and attempt to bastardize yet another thread.  The same guy who tried to argue that Storm could take Thor.
  Figures that OZONE would come here with his Storm loving rhetoric and non-sense views of "science" and attempt to bastardize yet another thread.  The same guy who tried to argue that Storm could take Thor. 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		