Give Magneto the time to say "MAGNETS" and nearly every fight ever is over. He has blocked planet scale dimensional transfers because MAGNETS. He has LOLnoped large scale reality warping because MAGNETS. He has created and held singularities in his hands because MAGNETS. He has called a vastly FTL planet killer bullet that has been flying away from earth for months halfway across the freaking universe in a couple of days because MAGNETS.
The only thing in Marvel more powerful than Magneto saying MAGNETS is Odin pointing the Gugnir at someone and howling "AMNESIA DUST."