This card trick is very impromptu and can be done with a borrowed deck. There is no need to practice and no sleights needed.
Trick:
You predict a card without even touching the deck.
Method:
You hand a whole deck to your spectator and tell him to shuffle it. You then tell him to count 26 cards which is half of the deck. As he/she is counting, you remember the seventh card. Then tell him/her to set aside the 26 cards counted. You then write your prediction to a piece of paper. Next, tell him/her to pick any three cards from the other half. After that tell him to put the other half on top of the counted 26 cards. Put the three cards in a row order face up. Tell him for each card how many will he add to make it 10. For example the three cards are a six, seven, and a king. You will add four cards to six, three cards to seven and zero to king as it is considered 10 together with jack or queen. You then add the three cards: six + seven + 10 (king) = 27. You then tell the spectator to get the remaining cards face down and count until the 27th card is reached. The 27th card is the card you predicted.
Here is a another free card trick that requires a bit of preparation and practice. It can be done with a borrowed deck with a little misdirection to perform the flip.
Effect:
The spectator’s chosen card appeared to be different from the rest.
Explanation:
You setup the deck with all face down except for one card at the bottom. You spread the card asking your spectator to choose one card. Be careful not to reveal the face up card at the bottom. You tell your spectator to pick the card, look at it, and remember the card but as he does, you flip the cards over. So you have one card face down and the rest face up. You tell your spectator to put the cards somewhere in the middle of the deck. Be careful not to reveal all face up cards. Then tell your spectator that you will put all cards behind you and reveal your card within a split second. What will you do here is you just get the top card and reveal it. This is obviously not his card. You then spread the cards face up to reveal one card that is face down. This is your spectator’s card.
