I would love to see a trick where you keep turning the same card over with different faces. Bill it as a card trick with just one card. I can think of a half dozen good ways to do it (and you'd need more than one).
There is a very basic three card trick. You turn each card up one at a time, showing that all three cards are the same(say king spades). End with all three face down in your hand. Then you show all three cards again and all three are a different card(king hearts). At no time are there more or less than 3 cards in your hand.
