Looks like you could also do it with a dumb car, using your pinky to control the car while you slide the cards around. Show there’s nothing behind the right card. Car starts behind the left card and you drag it behind the right card as you slide the left card, then you show there’s nothing behind the left card. When sliding the left card left and back again, you bring the car from behind the right card to in front of it and then the reveal. I might try to make a reply video, if I can be dexterous enough.
