I can't believe how much fun this is to practice in front of a mirror so I can't imagine how much fun the spectators have.

This is a very good idea for a card coming back to the top. The only downside to this trick is that the gimmick is way to thick, its like holding 4 to 5 cards thick plus is you must turn over the spectators signed card on top of that thick stack. I dont know why they could not make this gimmick thinner. People dont really notice this turn over with the gimmick but i have had people watch standing closely to me say it looks like you turned over more than just one card. If you want to be safe with this trick dont let people get too close to you maybe a few feet away is ok if done quick with the turn over they wont noticed the thick stack. Maybe they will improve this in the future.