The White Witch
Mysa Nal of the planet Naltor is a member of the Legion of Super-Heroes. She is also the sister of Dream Girl (first appearance: (as the Hag) Adv No. 350, Nov 1966: "The Outcast Super-Heroes!"; (as the White Witch) Legion of Super-Heroes No. 291, Sep 1982: "...A Sign of Darkness Dawning").