I want to be able to switch a deck of cards that are uncased nor held by anything, e.g. rubber bands, etc. The cards cannot be put down (e.g., behind something for even a second), nor be placed in something. It is to appear that I received a shuffled deck and nothing happens, although I have made the switch.
A topit could be used to get rid of the first deck. I thought of a sleeve drop to get the second, but uncased, that risks some cards falling.
Is anything available commercially? Can anyone make a suggestion?