Your change was well done, but the control didn't deceive me for even a second. Maybe it's the angle, or the camera quality or something, but it seemed very obvious. It's good to think outside of the box though, I used to do a similar control where I'd have a card outjogged from the back, covered with half of the deck in a sort of tent-vanish position, and close the deck as the selected card was apparently thrown in the middle. I never gave it much mileage because of how angle sensitive it was and how easy some other controls were.
I can't wait to see more stuff from you!