So by the end of the Buffy series Willow Rosenberg may have become the most powerful witch in the buffy universe. She literally turned all potential slayers into slayers. When she went dark before that she could've easily killed Buffy and almost ended the world.
Is she a stronger magic user than Dr Strange? I fell like she could easily drain whatever source of magic he has.
It would be an interesting magic fight to watch.
Edit: please excuse the spelling error in the thread title.