This is an Agatha Harkness/Salem Seven story—Scarlet Witch and Vision take on the Seven, believing that they killed Harnkess. The Seven are supposed to be witches, but they’re more like super-villains. They capture Wanda, and Vision breaks her out. During the battle, Harkness’ spirit appears in the sky, like Obi Wan Kenobi, telling Wanda to use her magic powers.
This inspires Wanda to use her magic to have a child.
Creators: Steve Englehart and Richard Howell