Magic Forums

I've read a lot about witchcraft and books about pagan deities. I see the term "witch goddess" and I take that to mean a feminine spirit who historically helped people do magic. We have Hecate of course, and Callieach, Cerridwen, and Morrigan from the Celtic/Welsh pantheon. But can't witches call on most any deity for assistance? Yahweh and the Angels help ceremonial magicians, and according to legend he helped a famous magician walk on water and turn water into wine. What makes some gods better for this than others? Also, which deities and spirits do you think are good choices to commune with if working magic?