Though this cosplayer might make me change my mind.
In the Marvel-DC Amalgam Comics Zee and Scarlet Witch are merged into one character Wanda Zatara, The White Witch. She sounds like an interesting character, but I have not read the issues she has been in. I guess her father was a combination of John Zatara (DC) and Doctor Druid (Marvel).
Since this is an RPG blog, here is a link to her stats for the Marvel SAGA system, http://www.chopshoptoys.com/Games/WhiteWitchsht.jpg
Trouble is, in truth, the things that irritate me about Scarlet Witch will also happen to Zatanna; ie making her too powerful, then not powerful enough, never know what to do with her powers. I feel that the latest round of authors, starting with Paul Dini, have made Zee better. Scarlet Witch is just dead in the Ultimate Universe as far as I know.
Any way here are some pics of Zee and Scarlet Witch teaming up.
Edited to add:
Scarlet Witch / Zatanna team up over at the Brave and the Bold/Super Team Family.