Forecast unveiled

Effect:Here is an automatic effect where you guess the choice of a spectator from three cards. The public can choose any card!

Materials needed:- An envelope.- A sheet of paper.- A pen.- Three playing cards: ace of hearts, ten of spades, queen of clubs for example.
Preparation:

Write on the paper: 'I was sure you would choose the 10 of spades'.
Place the sheet in the envelope and closes it without sticking.
Return the envelope and write on the back of it 'Ace of Hearts'.
Turn the queen of clubs and sign the back of this card the following message: 'I was sure you would choose the Queen of Clubs'.
Explanation:
Ask, faces up the three cards so as not to show the message on the back of a card.
Ask a member of the public to put the envelope on the map of choice. Make sure that the person does not show the back of the envelope!
You say you expected the result in advance. Depending on the position of the envelope, you will reveal your prediction of three different ways explained below:
First possibility:The person raises the envelope on the 10 of spades. Open the envelope and show the written message: 'I was sure you would choose the 10 of spades'.
Second possibility:The person raises the envelope on the ace of hearts. Simply return the envelope and show the message on the back.
Third possibility:The person raises the envelope of the queen of clubs. Return the registration card and show the back of it: 'I was sure you would choose the Queen of Clubs'.
CHARTER MAGIC
Never give out the tips of the towers so as not to disappoint the public.
Do not submit a trick you can not communicate well.
Do not run the same trick twice before the same audience.
Remember that there is no good and bad tricks, just good and bad presentations.