This is a Keeper that works in any Fluxx deck. It was our Holiday Gift for 2015. It was originally printed as a peel-off promo-postcard, then reprinted in 2020 as a loose single promo card.
It says: During your turn you can exchange this for any Keeper another player has in play.
Didn't expect much from a promo card, but this Keeper actually holds up in every Fluxx deck I own, and the retro holiday art is genuinely fun. The 2020 loose single is sturdier than the old peel-off version too.
The peel-off postcard version is such a weird piece of Fluxx history and I'm glad they reprinted it as a loose promo card in 2020. Slid it straight into my holiday deck and it fits right in with the other keepers.
Picked this up as a promo single rather than the original postcard version, and it fits right into my Fluxx deck as a Keeper. Only gripe is that it's a loose card with no packaging, so I have to keep it sleeved. Still a fun holiday-themed addition.