This is a Surprise which you can add to any Fluxx deck.
It says, "Out of turn: Cancel one game action of any kind that causes Keeper(s) on the table to change ownership. During your turn: Take a Keeper someone has on the table & add it to your hand."
This card is designed to counter Plunder-type Free Actions (among other things!) so, apart from Pirate Fluxx, it also goes particularly well in Firefly Fluxx, which also has Plunder, or Star Trek: TNG Fluxx, or DS9 Fluxx, which have the Rule of Acquisition.
This card was originally published in 2011 as a peel-off promo-postcard to promote the release of Pirate Fluxx. In 2020 we reprinted it as a loose single.