This is a vintage pre-owned item from Magic Methods dated 1975.
This is a quicker version of the classic Wild Card effect that uses only six cards instead of the usual nine cards. Some handling differences make this a version that you may find more to your liking.
If you don’t know the classic effect it basically is that a packet of cards are all shown to contain the exact same cards except for one card which is completely different and called the Wild Card. When this wild card comes into contact with the other cards they all turn into the Wild Cards.