I cannot for the life of me remember the name of this effect. It was an incredibly simple method with a fully gaffed deck, practically self-working.

The deck is spread to show all the cards are different. The deck is then closed and the back of one card is touched and shown as the selection. The deck is shuffled and one card is presented. The card is incorrect. A color change is done and is shown to be the correct card. Let’s say it was the 3 of Hearts. Then the deck is spread out face up again and every card is shown to be the 3 of Hearts. No deck switch. The method, again, was incredibly simple but only if you’re familiar with gaffed cards which excludes most laymen.

Does anyone know the name of this effect?