A GAFF CARD
The magician shows a blue back card. The audience can clearly see that there is a hole in the card and pass some objects. When the magician waves his hand, the card turns into red! The most amazing thing is that the hole disappears and turns into a black sticker.
The effect is shocking and very easy to do.
No need to set up in advance.
You can put it in your card box to perform at any time.