I saw Michael Ammar do this in his "lockdown lecture" which was generously gifted to us all by CC
during the first wave of COVID and I just had to have it.Lucky for me it was on sale when I found
it!
Of course this looks great on video even if you're not Michael Ammar. The cards are not
examinable but an experienced performer will know when and who to do the trick for. After all, when
you pull a deck with a blue-backed card on top from a blue tuck case and then show all the faces to
be different....