This is my first fan expansion, given that I'm relatively new to Dominion and this forum, so I would just love to hear some expert opinion on my cards and see whether they are broken/swingy etc. Here goes.
This expansion is called Frontiers, and its theme is discovery, exploration, and the lure of riches from a far off world.
It has a small top-of-deck theme, and, in being conceptually similar to Seaside, contains some Durations, including a Treasure-Duration and a Victory-Duration. It also contains many cards with a cost in Diamonds (which will be further abbreviated as D). This cost, similar to Potion, requires the player to play a basic treasure available in games with these cards, to produce the resource necessary to buy them. This basic treasure costs the same as Potion, however, it produces 2 Diamonds. And then there's the whole cost-in-coins-is-orthogonal-to-cost-in-Diamonds thing. But anyway. Here is the treasure:
Diamonds
$4
Treasure
2D
Frontiers
Kingdom cards(not necessarily in order):
Riches
$5
Treasure
Choose one: $2; or 2D.
Frontiers
Hostile Natives
$2+3D
Action-Attack
+2 Cards
Reveal a card from your hand. Each other player looks through their discard pile and reveals a card that shares a type with it. Then they either trash the revealed card or gain 2 Coppers, your choice.
Doomed Expedition
$5+1D
Action-Duration
+1 Card
+1 Action
Reveal the top 2 cards of your deck and set them aside, discarding them afterwards. For each Action card revealed, +1 Action. For each Treasure
revealed, +1 Card. If none were Actions or Treasures, then at the start of your next turn, +1 Buy, +2D, and trash this.
Storage Room
$2+1D
Action-Duration
+1D
Now and at the start of your next turn: +1 Card.
You may discard 2 cards for +2 Actions.
Trade Vessel
3D
Action
+1 Buy
+$2
+1D
Reveal the top card of your deck. If it's a Treasure, put it into your hand.
Voodoo Doll
$3+2D
Action-Attack
+2D
Each other player reveals the top card of their deck. If it costs $5 or more, they trash it and gain a cheaper card. If it doesn't, they gain a Curse.
The New World
4D
Action-Duration-Victory
+1 Card
Now and at the start of your next turn: +1 Action.
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3VP
Sea Monster
$1+3D
Action-Attack-Duration
+1 Card
Now and at the start of your next turn: +1D.
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While this is in play, other players cannot score Quests.
Buried Treasure
$3+1D
Treasure-Duration
$2
1D
At the start of your next turn: +$1.
Recover
$4+2D
Action
Trash a card from your hand. If it...
Costs more than $2, +1 Card
Costs more than $4, +1 Action
Has {Diamonds} in its cost, +1 Card, +1D
Has [Potion] or <Debt> in its cost, +1 Buy, +$2
Explore
$1+1D
Action-Reaction
Look at the top 2 cards of your deck, put one on top, and the other on the bottom.
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When another player plays an Attack card, you may first reveal this from your hand, to look at the top 3 cards of your deck and discard any number, putting the rest back on top.
Quests
These are event-shaped cards with red frames that contain a goal that any player may try to complete. If a player has fulfilled the requirements of the quest, they score it at the given time to receive the reward. Scored quests are tracked by wooden cubes of the players colour, placed on the quest when it is scored. A player may not score an quest more than once. Players are not obliged to score an quest as soon as they fulfill the requirements, they may wait a few turns, but if they do, they must complete the quest's requirements again.
Voyage
Quest
When you have no cards left in your deck, you may score this at the end of your turn, to look through your discard pile and put 2 cards from it onto your deck.
Peace Treaty
Quest
If no Attack cards have been played since your last turn, you may score this at the start of your turn, to draw 2 additional cards.
Vendetta
Quest
When you play more than 5 Action cards in your turn, you may score this at the start of the Action phase of your next turn, for +2 Cards and +1 Action.
Wealth
Quest
When you make more than $9 in your turn, you may score this at the start of the Buy phase of your next turn, for +$2 and +1 Buy.
Subdivision
Quest
When you buy a card worth more than 4VP, you may score this at the end of your turn.
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At the end of the game, this is worth 4VP just for players who have scored this.
Drought
Quest
When you end a turn without doing anything, you may score this at the start of your next turn, to gain a card costing up to $4.
Land Acquisition
Quest
When you buy 3 victory cards in one of your turns, you may score this at the end of your turn to gain a Duchy.
Overpopulation
Quest
When you gain the last card from a Supply pile, you may score this immediately. If you do, you may put that card onto your deck and gain a card with the same cost.
Recruitment
Quest
When you play 3 Attack cards in the same turn, you may score this at the end of your turn. If you do, each other player discards down to 3 cards in hand.
Purification
Quest
When you trash 5 cards in your turn, you may score this at the end of your turn, to trash up to 2 cards from your hand or in play.
And there you have it. Please let me know your thoughts on these cards and give me feedback, and I will make any changes to these cards that are deemed necessary. Enjoy!