I, too, make many of my cards using dies; so this was not a challenge for me at all. Mine today uses the Lawn Fawn Magic Picture Changer die and a fun stamp set from Kindred Stamps called Arabian Nights.
When you pull the tab, the magic happens.
I even made a video to show how the mechanism works.
Be sure to check out the CCEE Stampers blog to see which dies the rest of the team used on their cards for this challenge.