Finally, I got my hands on Bad Fairy. In fact, I got a backup bottle, too.
Bad Fairy is a berry/gold duochrome foil.
Basecoat: Gelous (2 coats)
Color: MAC Bad Fairy (4 coats)
Topcoat: DAvid (1 coat)
Bad Fairy was not as opaque as I would have liked - it took four coats and I could still see some bald patches. My brush is a little wonky but not too bad. Cleanup was about like you would expect for a foil. I love this color but I'll wear it sparingly - as others have reported, I have a noticeable drop in bottle fullness after only one wear.