kammagic shows you the Christ Ace card trick. You start off with a regular deck of cards and choose 4 cards, these should be signed, and split the deck into 4 piles. Place each card into a pile then put all the piles on top of each other. After the first two cards are revealed, you can ask the member of the audience what their card was and using letters as cards, spell that out. You will get to their card. For the final card simply turn the deck and reveal that there's only one card facing down. Turn that around and it's the fourth card from the start.