Fisheries of Gloucester: Fisherman's Feud Promo PackExpansion

From BoardGameGeek:

This promotional pack was provided to Kickstarter backers of Fisheries of Gloucester, and then directly from publisher. The pack has 6 double-sided game cards and 2 rule cards. At the game start, each player drafts 3 cards and places them "star-side" face up. Each round a player may use one card's special ability. If it's on its star side (with more powerful ability), the player turns it to the other side and then gives it to the other player, who may use the card on a later day. If the card is already on its non-star side, it is discarded after use. -description from the publisher