The spectator is handed the deck and asked to name a number between 10 and 20 and to count that many 1 at a time off on to the table. The spec is then asked to add the digits of their number and count that many 1 at a time back on to the top of the deck. The new top card on the pile on the table will be their card. The then look at it, remember it, and place it along with the pile back on the deck. The spec then cuts the deck and spreads it on the table. Their card is the only face up card in the deck! Amazing effect because it happens totally in the spec's hands!
This trick is suitable for all levels.