To begin with the idea of this trick is good but technically speaking after you perform the trick
you cannot hand over the card for the spectator to examine. If by all means you do so it would be an
epic fail. The reason for the 4 star being that this trick would be great for stage magic where you
say you did a prediction an it's in this envelope and that it would be rare that the spectator would
want to examine anything. But if do street magic most definitely this would not be ideal because the
first time i did it my spectator wanted to see the card but I couldn't give it to her as the trick
would fail then. So to conclude, this trick is not clean. Nothing in that envelope and after the
trick can be handed out for examination.