If the card is the 4♦, pull out the 8♦ for the suit, then the 4♠ for the value. In this case, you don’t add the suit card to the other cards to make the value. Practise so you are confident with working out the set of cards you need for each selection, and practise the patter or dialogue as that’s what sells the trick. Remember, this is a great feat of mental powers, so make sure it looks like it. You could present this as a psychic experiment where you claim you can read the printing on the cards with.
