every magician's dream
a card in a visible case, a deck is mixed by a spectator three piles are made, one of the piles is chosen freely
the 2 cards from the top of the not chosen piles are shown, they are different cards, from the chosen pile the 3 cards from the top are taken
of the 3 cards the spectator thinks of one of them, these 3 cards are lost in the deck, the magician takes the card out of the case and holds it in his hand.
is turned this one and it's the same one thought out by the view

strengths
the deck is mixed by the spectator, the magician holds the card in his hand before the spectator has named it, the case can be dispensed with and make the effect without it, everything is self-contained, the gimmick does all the work for you