A cross card consists of two cards that are nested in a cross shape: one set of red and one set of green.
First, you will pull the red deck first, shocking them up. You or someone else will randomly pick one and remember it.
Then put the card in the deck and put the deck in the box. Next, remove the blue deck from the box.
Guess what you’ll find out of the blue cards you take out? You should see the red card selected earlier ..