Moonstone

Dr. Karla Sofen, AKA Moonstone gained her powers from an alien gem which she absorbed after extracting it via psychological manipulation of the original Moonstone, Lloyd Bloch. She can fly, become intangible, blast energy from her hands and emit blinding flash.

When Norman Osborn began his Dark Avengers, he hired Dr. Sofen to become his Dark Ms Marvel.

Earth's Mightiest
Moonstone was eliminated by War Machine in the opening round.