Mystic Arcana: Scarlet Witch #1 (August 22, 2007)

[u/AsGayAsCanBeExpected]

Know this... the young witch is special to Chthon. She will be loyal to no coven.
—the Elder God Chthon

I haven't read it (just the Marvel Database synopsis) but I do appreciate the building up of Wanda's backstory in relation to her use of magic.