X-Zone by Katsuya Masuda - Trick
The magician takes out a deck of cards that looks quite strange. A red deck of cards inside a red card case.is crossed by a blue deck of cards He pulls out the blue deck and proves it to be a full deck. Then the performer pulls out the red deck from the case, which is also turned out to be a full deck.
Comes complete with gimmicked red and blue Bicycle decks and instruction sheet.