This is an Oz-inspired New Rule card that can be added to any Fluxx deck.
It reads, "If you sing a few bars of an Oz-themed song during your turn, draw 1 extra card. Draw another extra card if no one has yet used this song for this reason during this game."
This card was published in 2012 to promote the release of Oz Fluxx. It was originally printed as a promo-postcard, but has now been reprinted as a loose singleton.