I was just reading through the Most powerful hero thread and thought "Why not try a vilain thread?" So I did. And here it is.
If there's someone like Wanda who's sort of a villain and a hero or something debatable, well, that can pretty much pass.
I don't know why everyone says Magneto is most powerful he just controls magnetism, then again, I haven't read very much of him.
So i'll probably say Wanda.