but then ends with the spectators knowing even less than when they started

The card is lost in the deck

You will receive two lenses prepared on both sides

and one of the main reasons is that it's hard to find a perfect set of cups and bag

Everything taught in this downloadable video/eBook:

Subtle Card Creations Vol 9 | Nick Trost No Skill Required but then ends with theNick Trost's Subtle Card Creations series of easy to do card effects comes to completion with Volume 9 . As in the other volumes in the series these routines rely on subtle moves and principles rather than difficult sleight of hand. Once again there are over 100 tricks, this time collected in 11 chapters covering gambling tricks, puzzlers, divinations, gilbreath tricks, cards and dice, tricks with 2 decks, ESP tricks and more. Foreword by Howard