-You need :
    1) a set of ordinary cards
    2) an assistant
    3) an audience

-How to perform :
    1) Deal the cards throughally
    2) Ask an audience to pick out a card from the pile holding it upright but not showing  it to you
    3) Ask your assistant to hold up a mirror behind the audience,
    4) and therefore, you can see what the card is .

Hey you think it is cheating? Oh, but it is just an warm-up for you. Plus, always remember things about magic are more complicated then they look. Even this little trick takes exercises to make perfect.

-Activity: Figure out what the positions of you, the mirror, and the card should be in order for this trick to work. Try to look into the mirror at different positions or angles and see that only within certain angle/ position would you be able to read the card from the mirror.