The results for the Non-Attack Interaction challenge are in! Here were the criteria:
Design a card that is not an Attack card but that, when played by one player, allows or requires at least one other player to act. The card may not be "targeted" in the sense that it allows the player to choose which opponent(s) are affected.
I've got nothing of my own this time, so let's get straight to it. As with the Village contest, the winner ran away with it:
#1 - Amulet by
Kirian with 31 points
(Dragonfruit)$5 - Treasure
Worth $3
Each other player may trash a card from his hand.
This entry in the Contraband/Cache category lets you have a cheap Gold in exchange for giving out some free trashing to your opponents. As with Bishop, the severity of this penalty depends a lot on the kingdom at hand. Unlike Bishop, this doesn't help you trash down as well, but the boost to your economy, especially in the early game, could be very well worth it.
The rest of the ballot has a lot of intriguing ideas deserving of exploration:
#2 (tie) - Artificer by
eHalcyon with 13 points
(Clementine)$5 - Action
+5 Cards
+1 Action
Reveal your hand. The player to your left chooses a card to discard from your hand, then the player to your right does the same.
#2 (tie) - World's Fair by
Mecherath with 13 points
(Banana)$3 - Action
Trash this card.
Gain a card costing up to $6, placing it on top of your deck.
Each other player may gain a copy of the card you gained.
#4 - Inheritance by
nopawnsintended with 11 points
(Kiwi)$5 - Action
+$2
Each other player may reveal an Estate. If no Estates are revealed, +1 Card, +1 Action, +$1.
#5 - Smelt by
Tables with 10 points
(Strawberry)$5 - Action
+3 Cards
Reveal your hand and trash two Copper cards. If you do, gain a Silver, putting it into your hand. Each other player may trash a Copper from their hand or gain a Copper, putting it into their hand.
#6 (tie) - Beggar by
Drab Emordnilap with 9 points
(Raspberry)$2 - Action
+1 Card
+$1
Each other player may trash a Treasure from his hand. You gain all of these trashed cards; put them into your hand. If no player trashes a treasure this way, +$1.
#6 (tie) - Ward by
A Drowned Kernel with 9 points
(Pomegranate)$2 - Action
+1 Action
+$1
Each other player may discard his hand and draw four cards. If any do, you do too.
#6 (tie) - Coffers by
Dsell with 9 points
(Kumquat)$5 - Action
+$3
Each other player may gain 2 coppers, putting one into their hand.
#6 (tie) - Philanthropist (1) by
One Armed Man with 9 points
(Blueberry)$5 - Action
+$4
While this is in play, Victory cards cost +$1 and each other player gains a copy of the first non-Victory card you buy during your Buy step.
#10 (tie) - Ramp by
WanderingWinder with 8 points
(Peach)$3 - Action
Trash a card. Gain a card costing up to twice the cost of the trashed card.
Each opponent may gain a card costing up to the cost of the trashed card.
#10 (tie) - Salesman by
Michaelf7777777 with 8 points
(Lime)$5 - Action
Choose 1: +2 Cards; +2 Actions; +2 Coins; +1 Buy and +1 VP.
The player to your left chooses 1 for you to receive: +2 Cards; +2 Actions; +2 Coins; +1 Buy and +1 VP.
#10 (tie) - Stagecoach by
Tejayes with 8 points
(Guava)$4 - Action
+1 Card
+1 Action
Each player (including you) may trash a card from his hand, then draw a card if he does.
If any other player trashes a card this way, +1 Card.
#10 (tie) - Horse Farm by
Polk5440 with 8 points
(Gooseberry)$5 - Action
You may discard up to two cards. If you discard a Treasure, +4 Cards, +1 Action. If you discard two cards, +1 Buy.
Each other player may discard a Treasure. If he does, he draws 2 cards.
#14 - Inspector by
dnkywin with 7 points
(Blackberry)$4 - Action
The player to your left names two cards (the two cards are allowed to be the same). Reveal the top 5 cards in your deck, and pick one: put all instances of cards the player to your left named into your hand, or put all cards that the player to your left did not name into your hand. Discard the rest.
#15 (tie) - Philanthropist (2) by
andwilk with 5 points
(Tangerine)$3 - Action
Choose to draw between 2 and 5 cards. Discard from your hand 2 less cards than you drew. Your opponents draw and discard a number of cards equal to what you discarded.
#15 (tie) - Campaign by
ChocophileBenj with 5 points
(Pineapple)$5 - Action
+1 Action
Each other player may trash a card from his hand. If anyone does, +$3. If no one does, you may trash a card from your hand, +$2 if you do.
#15 (tie) - Mad Scientist by
DWetzel with 5 points
(Date)$2P - Action
The opponent to your left chooses two: +2 Cards; +2 Actions; +$2 and +P.
#15 (tie) - Flag by
Powerman with 5 points
(Cantaloupe)$3 - Action
Choose one: +2 Cards; or +$2; or the player to your left chooses +3 Cards or +$3.
Each player (including you) may trash a card from their hand. If no one does, each player gains a Silver, placing it on top of their deck.
#15 (tie) - Prospector (1) by
Graystripe77 with 5 points
(Apple)$5 - Action
+$1
Trash a card from your hand.
Draw up to 5 cards in hand.
Each other player may put a card from their hand on top of their deck.
#20 (tie) - Antique Traders by
Nicrosil with 4 points
(Plum)$5 - Action
+2 VP
Discard down to 2 cards in hand. Gain a Silver, putting it in hand.
Each other player may trash up to two cards in hand.
#20 (tie) - Courtier by
Schneau with 4 points
(Papaya)$5 - Action
Gain a Gold in hand. Discard 2 cards. Every other player may gain a Silver in hand.
#20 (tie) - Body Snatcher by
brokoli with 4 points
(Nectarine)$3 - Action
The player to your left reveals two cards costing more than $0 from his hand. Name one.
Gain a card of the same price as the named card.
--
(Rule clarification: If he have less than two cards costing more than $0, he reveal his hand, and you gain no benefit.)#20 (tie) - Trading House by
heatthespurs with 4 points
(Grapefruit)$3 - Action
+$2
You may trash all the cards in the Trading House mat.
Each player (including you) chooses one: put a card from his hand into the Trading House mat; or gain a card from the Trading House mat and put it into his hand
--
(Rules clarification: All cards on the Trading House mat are visible to all players at all times.)#20 (tie) - Maven by
Guy Srinivasan with 4 points
(Fig)$2 - Action
+1 Action
Each player puts a Victory token on a non-empty Supply pile.
You may trash a card from your hand. If you do, +1 VP per Victory token on that card's pile and remove those tokens from that pile.
#20 (tie) - Scrap Heap by
Bella Cullen with 4 points
(Elderberry)$3* - Action
+1 Action
+1 Card
Each other player may trash a card from hand. If a Scrap Heap is in play, +1 VP for each card trashed.
--
If another card that allows trashing on play is in the kingdom, this card costs $6.
#20 (tie) - Tartuffe by
Garth One-eye with 4 points
(Currant)$4 - Action
Trash any number of cards from your hand. +$1 for each card trashed this way.
Each other player may trash up to two cards from his hand.
Gain the trashed cards.
#20 (tie) - Inventor by
Qvist with 4 points
(Cherry)$4 - Action
+1 Card
+1 Action
Each other player may reveal a copy of Inventor from his hand. If no one does, +$2.
#28 (tie) - Treaty by
yuma with 3 points
(Watermelon)$5 - Action
+2 Cards
+$3
+1 Buy
When you play this card, each other player may exchange a card costing more than $2 from their hand for a copy of a card that you have played this turn, including this one. You may either gain the exchanged cards or trash them.
#28 (tie) - Dilemma by
Auto-Destruct Sequence with 3 points
(Pear)$5 - Action
The player to your left chooses one for you to receive:
+$4, +1 Buy
+2 Cards, +1 Action
+2 VPs
#28 (tie) - Stalker by
NoMoreFun with 3 points
(Orange)$4 - Action
+2 Cards
Name a card. Each other player reveals the bottom card of his deck. If the named card is revealed, +1 Action, +$1.
--
(Rules clarification: After the reveal, the card is returned to the bottom of his deck.)#28 (tie) - False Prophet by
Robz888 with 3 points
(Lemon)$3 - Action
Name an Action card. The player to your left either reveals the named card, or reveals a hand with no such card. If he revealed the named card, you play it. At the start of Clean-up, return the card to the player's hand. If he did not reveal the card you named, you get +1 Card, +1 Action, and gain a Curse.
#28 (tie) - Incinerator by
FishingVillage with 3 points
(Grape)$3 - Action
Each player may trash up to 2 cards from his hand. +$1 per 2 cards trashed in total, rounded down.
#28 (tie) - Spoils by
Kelume with 3 points
(Carambola)$4 - Action
+$3
Clockwise starting from the player on your left, each player chooses one: +1 VP; +1 Card; gain a Silver; trash a card from hand. No player may choose the same option as any previous player.
#28 (tie) - Pagan Rites by
zahlman with 3 points
(Apricot)$4 - Action
+1 Action
Discard any number of cards from your hand. Draw until you have 5 cards in hand.
Each other player with at least 5 cards may discard his hand and then draw 5 cards.
#35 (tie) - Prospector (2) by
Fragasnap with 2 points
(Tamarind)$3 - Action
+1 Buy
+$1
You may discard 2 cards from your hand. If you do, gain a Treasure costing up to $3, putting it into your hand.
Each other player may discard a card. Each player who does gains a Silver.
#35 (tie) - Plunderer by
Dubdubdubdub with 2 points
(Mango)$5 - Action
Each opponent may choose one: gain a Copper in hand, or gain an Estate in hand.
Choose three of the following: +1 Card, +1 Action, +$1, +1 Buy. (The choices don't have to be different.)
--
(Rules clarification: Like with Pawn, you have to choose all three before drawing any cards.)#37 (tie) - Gambler by
Adrienaline with 1 point
(Honeydew)$6 - Action
+2 Cards
You may trash 3 random cards from your hand. If you do, gain a Province, putting it on top of your deck.
Every other player may trash two random cards from their hand. If they do, they gain a Gambler, Duchy, or Gold of their choice.
#37 (tie) - Procession by
popsofctown with 1 point
(Boysenberry)$5 - Action
Draw one fewer card than last turn during Cleanup this turn. Take an extra turn after this one. During that: Players see all you see. If you may play a card, do so. If you may buy or gain a card, do so, selecting one with the highest cost in coins. The player to your left makes all decisions for you.
#39 - Lucky Fountain by
Saucery with 0 points
(Huckleberry)$6 - Action
+$2
+1 Buy
+$1 per differently named action card you have in play (including this).
When you play this card, each other player may place a card on top of his deck, or gain a Copper, putting it into his hand.