Imagine this. The spectators shuffle the deck, they peek at a card, and they shuffle the deck yet again.
Still, the performer can name up to 4 spectators' cards individually, one by one!
Perform it in close-up, parlor, or stage conditions.
No memory work
No marked cards
No angle issues
Super easy to master and to perform
JUSTIFICATION OF USING A JUMBO DECK
Because a normal-sized deck is smaller than the magician's hand, that makes it possible to use sleight of hand techniques. Due to this being a mental experiment, I would like to avoid the possibility of using any sleight of hand techniques; therefore we use a Jumbo deck for this demonstration.