How powerful is base Raven's magic?

In just a normal form, how powerful is her magic?

Who is the most powerful person she can hang with? Superman? Green Lantern? Anyone?

Raven's base powers aren't really combat-oriented. Perez and Wolfman originally developed her as a healer and an empath, with the occasional use of her Deus Ex style Soul Self. They didn't really see it as necessary to define her powers in line with anyone else's. I consider that an admirable storytelling choice.