Your participant takes a shuffled deck of the 22 Major Arcana from a Tarot deck, and blindly slips an upturned card anywhere in the deck behind their back. They then place the face down deck on the table and place their hand on top of the deck.
You then place one of your hands on top of theirs and, after a little internal focus, proceed to give a reading pertaining to two dominant personality traits of theirs with amazing accuracy. You also state which 2 cards would represent this reading.
This in itself is quite amazing to your participant, but the real stunner is when they spread the deck. They find the card they upturned, as well as the two cards surrounding it. Those two surrounding cards are indeed the exact two cards that you read for them from pure intuition!
You don't touch the cards at any time during the effect. It literally all happens in their hands, which bolsters the effect tenfold.
No gimmicks or sleights. It is totally self-working and can have a different outcome each time with 100% accuracy.