Tony Binarelli developed this effect more than 30 years ago and refined it to perfection.
A spectator is blindfolded while the mentalist asks three different persons sitting in the audience to choose three cards that are subsequently shuffled with the rest. The blindfold is removed. Without any sleight of hand, just by fanning slowly through the cards, the spectator will spot and remove the chosen cards himself from the deck.
The selections appear to be enormously increased in size for the spectator while they still look totally normal to the audience.
This unexplainable effect. comes in a “marked” red backed Phoenix Parlour Deck- Two presentations included. (stage and close-up)