Any Three Card Suits Are Freely Chosen. The Ending Will Surprise

A magic trick with a twist at the end is always met with audience acceptance. The video shown opposite is of such classification.
The audience freely chooses 3 suits from the 4 available in a deck of cards.
From the 4 cards in the magician's hat, the three chosen suits are removed one by one.
The one remaining card is then drawn out, and amazingly it appears as completely BLANK! It may be examined closely by any of the audience.