If you think you know the specs of the Mystery card, sign my questbook and put the specs in the body of your message. The spec format should be just like how I listed my favorite cards' format. Also in the message, include a link to your banner. You probably have a site or else you wouldn't be advertising it!!!!!!!
Make a banner that is 468 pixels wide by 60 pixels tall.
Make sure that it is a GIF image and not a JPEG image.
I would prefer for it to be transparent, but its your choice.
It should be less then 9K in size (9216 bytes).
Remember: Animated banners get more click-throughs then idle ones.
You can either make that banner the title banner of your page or stash it in your page somewhere so you are able to give me a link to it! Of course, you want to give me a private message in the guestbook or else everyone else will know the answer! The more sites in my advertisement page, the less of a chance that people will click on your banner!