Imagine a shuffled deck of cards, The spectator takes out any card in the deck then, they place it back inside the pack and shuffled again until they're satisfied. After shuffling, the deck is back to the magician and the magician can locate the selected card and turn it face up in the deck under the table without peeking or having a stacked deck. Do miracles with just a deck of cards.

No peeks
No Stacks
No memory work
No skilled required
Cards are genuinely shuffled by the participant
Learn in minutes.
Fooler
100 percent impromptu