I love the version where you quickly jerk the card up a bit to do the change, because it completely hides any flicking and just looks so clean. I'm shocked that you can also do that with jumbo cards >_>
Actually to be honest the jumbo one I just tried, but it was really similar to the small ones. That and I cut out the ones I flashed on. The low frame rate hides the change well.
very smooth but this is not really a clean up where you could hand out the card, just a way of hiding the other card. For an awesome example of the clean up i'm refering to check out the trick "Proteus" from BFU.