This is one of the Zodiac stamps from Kadoodle (available via the Craft Barn whose online shop is now live!!! Great delivery and products, I've already tried it out).
Kadoodle also have some wonderful blog candy to give away so make sure that you don't miss out on that awesome stamp! Every Monday from now until Christmas there will be candy up for grabs so please keep checking the Kadoodle blog.
I used my DT Kit to make this sample card so all products are available from the Craft Barn