Enchantress vs Magneto
In a straight up fight, I honestly think Magneto has a good chance against her...despite my belief that he is at a big disadvantage against any magic user...especially those with the durability to take a beating and retailiate.
However, what if the Enchantress fought him using her greatest strength...her looks and ability to seduce a man...does Magneto have what it takes to successfully resist her godly, highly feminine, charms?
In this senario if Mags gets seduced, he loses as she can make him her pawn or kill him whenever she feels like it...