Suppose you play a 2p Dominion game (with all expansions). There are no pure "victory" cards (Gardens, Duke, Vineyards, Fairgrounds) among the 10 selected kingdom cards (nor in Black Market deck, in case there is any). You are ahead on victory points. You have 6 cards in the draw pile, and since you count the cards, you know those are all coppers.
You begin your turn with only one card in your hand (due to, say, opponent's Torturers, but that's not important). It is an action card and it's not a Golem. Out of boredom, you play this card, and before you do what is written on the card, you realize that this will be your last turn and that you will lose the game, no matter what you do after that play, no matter what cards are in your opponent's current hand and in his draw pile. (Assume that your opponent will end the game on his turn if he will be able to and if he will win.)
What was that action? What did happen? (So far I have found solutions with 2 different action cards)
Puzzle MKII: same story, but with only 2 cards in your hand - King's Court and an unknown action card (not a Golem). You KC that action, it will be your last turn and you will lose no matter what you do after you play the action. (4 different action cards solutions)