What you receive is a pair of dice and a deck of cards. The beauty of this effect id that it yields a different result each time.
Effect: The magician presents a deck of cards and instructs the spectator to shuffle. After the deck is shuffled the spectator is instructed to roll the dice. Once the dice have rolled the spectator now turns the dice over and adds the numbers. After the dice are rolled one more time, the numbers are all added up. The spectator uses this number to count that many cards off the top of the deck. The last card is then predicted by the magician!