Worthwhile one card (mini) expansions
G. Gomez
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There are quite a few games out there which have a one or two card expansion. Basically the expansion was meant as a promotional item and yet sometimes it works beautifully. Sadly, other times it is good only for completist or even it may have been meant only as an (inside) joke.

Since these are promotional items, quantities are quite reduced and they quickly go out of print. By the time you may have found out about it it might already be too late.

What are the top rated and most wortwhile one card expansions out there?
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1. Board Game: Dominion: Governor Promo Card [Average Rating:7.84 Unranked] [Average Rating:7.84 Unranked]
Yoki Erdtman
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The Dominion: Governor Promo Card is another (1)1-card promo for Dominion that I find a godo addition to the base game.
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2. Board Game: Power Grid: Transformer Station [Average Rating:7.53 Unranked] [Average Rating:7.53 Unranked]
Joshua Miller
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Holland
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I'm not really a fan of the Flux Generator card you posted, but I enjoy playing with this little curveball. The seemingly small boost can save you from buying an entirely new plant, and has the potential to dramatically alter the dynamics of the endgame.
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3. Board Game: Dominion: Walled Village Promo Card [Average Rating:7.51 Unranked] [Average Rating:7.51 Unranked]
Yoki Erdtman
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The Dominion: Walled Village Promo Card is so much better in German, where it is simply called "Carcassonne", but it is still a worthwhile 1-card expansion.
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4. Board Game: Power Grid: Flux Generator [Average Rating:7.51 Unranked] [Average Rating:7.51 Unranked]
G. Gomez
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This is the jokey type of one card expansion. It severely unbalances the game, it is simply too powerful, even if some people out there do seem to like it.
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5. Board Game: Lord of the Rings: The Black Gate [Average Rating:7.41 Unranked] [Average Rating:7.41 Unranked]
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Four cards, but then two were released officially, so then, a single two sided card.
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6. Board Game: Caylus Expansion: The Jeweller [Average Rating:7.40 Unranked] [Average Rating:7.40 Unranked]
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1 tile expansion for Caylus. Useful for converting gold into prestige.

Originally an Essen giveaway, also included with the Premium edition.
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7. Board Game: Dominion: Stash Promo Card [Average Rating:7.31 Unranked] [Average Rating:7.31 Unranked]
Yoki Erdtman
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Dominion: Stash Promo Card is a 1-card promo that I have yet to try.
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8. Board Game: Carson City: The Indian [Average Rating:7.32 Unranked] [Average Rating:7.32 Unranked]
Yoki Erdtman
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Carson City: The Indian ranks as my most worthwhile of the single card (or tile as is the case) expansions that I have come across. This extra role adds a lot to the game, especially once you start playing the game using the red side of all the personalities.
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9. Board Game: The Settlers of Zarahemla Mini-Expansion [Average Rating:7.29 Unranked] [Average Rating:7.29 Unranked]
G. Gomez
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A two card expansion, which many want, but is long ago out of print. Nice to have it, but not necessary.
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10. Board Game: Ghost Stories: Jean-Claude Van Rice [Average Rating:7.23 Unranked] [Average Rating:7.23 Unranked]
Yoki Erdtman
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The Ghost Stories promotional 1-card Wu Feng expansions, such as Ghost Stories: Jean-Claude Van Rice, are truly epic!
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11. Board Game: Alien Frontiers: The Mind Control Helmet [Average Rating:7.23 Unranked] [Average Rating:7.23 Unranked]
Yoki Erdtman
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Alien Frontiers: The Mind Control Helmet qualifies as a worthy 1-card promotional expansion. It's power to use one of your opponent's ships as if it was your own is quite fun, even if it is costly to use. It's a good addition to the game.
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12. Board Game: Dominion: Envoy Promo Card [Average Rating:7.23 Unranked] [Average Rating:7.23 Unranked]
Yoki Erdtman
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The Dominion: Envoy Promo Card promo card is very popular with my gaming buddies, and I find that it adds very nicely to the game.
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13. Board Game: Agricola: Through the Seasons [Average Rating:7.17 Unranked] [Average Rating:7.17 Unranked]
Yoki Erdtman
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If postcards count, then Agricola: Through the Seasons is definitely a worthwhile 1-card expansion that every fan of Agricola should try.
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14. Board Game: Ghost Stories: Steven Qi-Gal [Average Rating:7.13 Unranked] [Average Rating:7.13 Unranked]
Yoki Erdtman
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The Ghost Stories promotional 1-card Wu Feng expansions, such as Ghost Stories: Steven Qi-Gal, are truly epic!
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15. Board Game: Ghost Stories: B-Rice Lee [Average Rating:7.12 Unranked] [Average Rating:7.12 Unranked]
Yoki Erdtman
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The Ghost Stories promotional 1-card Wu Feng expansions, such as Ghost Stories: B-Rice Lee, are truly epic!
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16. Board Game: Dominion: Black Market Promo Card [Average Rating:7.13 Unranked] [Average Rating:7.13 Unranked]
Yoki Erdtman
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While I personally don't like the Dominion: Black Market Promo Card promo card, I know that there are plenty of people who do.
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17. Board Game: Ghost Stories: Chuck No-Rice [Average Rating:7.08 Unranked] [Average Rating:7.08 Unranked]
Joshua Miller
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Holland
Michigan
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Chuck No-Rice knows how to win The Ungame.

Chuck No-Rice finds Advanced Squad Leader to be very basic.

Chuck No-Rice can list every Reiner Knizia game.

Chuck No-Rice once won Settlers of Catan on the first turn.

Chuck No-Rice can set up Case Blue in four minutes.

Chuck No-Rice invented victory points.

Chuck No-Rice is undefeated at L-C-R.

There are at least three one-card promo "expansions" for Ghost Stories. This is my favorite.
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18. Board Game: Drum Roll: Plate Spinner [Average Rating:6.99 Unranked] [Average Rating:6.99 Unranked]
Yoki Erdtman
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The Drum Roll: Plate Spinner, the Plate Spinner performer, is a great 1-card addition to Drum Roll. Although it is truly best if you can score three copies of it, and add them all to your deck of performers.
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19. Board Game: 7 Wonders: Leaders – Stevie [Average Rating:6.97 Unranked] [Average Rating:6.97 Unranked]
Yoki Erdtman
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As I don't enjoy 7 Wonders, the 7 Wonders: Leaders – Stevie does little to float my boat, but some may like it.
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20. Board Game: Isfahan [Average Rating:6.95 Unranked] [Average Rating:6.95 Unranked]
Joshua Miller
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This Samarkand expansion is the probably the first one-card expansion I ever owned. It adds some fluidity and tactics to the game, although it also shortens the strategic horizon. I think the game is (slightly) better with it than without it.
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21. Board Game: Alien Frontiers: The Space Crane [Average Rating:6.95 Unranked] [Average Rating:6.95 Unranked]
Yoki Erdtman
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The Alien Frontiers: The Space Crane promo consists of two copies of the same alien tech card. I would enjoy having this promo myself.
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22. Board Game: Caylus Magna Carta: The Library [Average Rating:6.80 Unranked] [Average Rating:6.80 Unranked]
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1 card expansion for Caylus Magna Carta.

Included in the Rio Grande edition.

From the comments, some people really like it and others don't.
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23. Board Game: Coloretto: Zwei Neue Übersichtskarten [Average Rating:6.76 Unranked] [Average Rating:6.76 Unranked]
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Coloretto has many mini-expansions, this is the smallest. Gets a high rating.
 
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24. Board Game: The Adventurers: The Temple of Chac – Dalia Cardoso [Average Rating:6.89 Unranked] [Average Rating:6.89 Unranked]
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Also a miniature.
 
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25. Board Game: Pandemie: Uitbreiding "De Generalist" [Average Rating:6.62 Unranked] [Average Rating:6.62 Unranked]
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Another promotional card that was later published in an expansion. This is available also in one of the homebrew Artscow decks with different art.
 
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