A: No. Exchanging a Keeper is not the same as playing it. The Exchange Keepers Action could be stopped with the Surprise Avast (Halt! Stop That) but not with That’s Mine!
A: It means no-one can steal a Keeper, or a card from your hand, or trade hands with you, or whatever might alter your assets while you’re gone* (but you also would not benefit from Everybody Gets One!). We would consider not looking at someone’s hand to be baseline good sportsmanship, which does not have to be regulated.
“Don’t cheat” is kind of the first rule of every game (unless the game is really outside-the-box, in which case I’d expect it to be very explicit about what kinds of “cheating” are allowed, I guess. And if it’s allowed… is it cheating?)
* Here is a list of the cards in Firefly Fluxx which would not apply to you while you were “In Your Bunk”:
Mix It All Up
Everybody Gets 1
Use What You Take
The Elder Sign, in Cthulhu Fluxx specifically states that the Creeper it’s covering moves with it. This is not specifically noted for other attaching Creepers. Does that mean other attaching Creepers don’t move with their attached Keeper?
A: The reason the Elder sign specifically tells you that its Creeper comes along for the ride is that the Creeper associated with the Elder Sign is not actually attached, rather, it is being nullified. Hiding in this fashion does not constitute attachment: you’re completely hiding the Creeper as though it doesn’t exist for you. Therefore it can’t prevent you from winning, but neither can it be used for a Goal.
Also note that the Elder Sign can hide ANY Creeper, even if it’s one that is not capable of attachment (but if it is an attaching type Creeper, you can’t hide it if it’s already attached to some other Keeper, hence the requirement that the Creeper be unattached in order to hide it).
A: After some discussion, we decided that Exchanging Keepers does not count as “Stealing” a Keeper.
Think of it this way: you cannot then reverse the action against your opponent. (What would that mean “and instead you [Exchange] one of their Keepers”? – that doesn’t really make sense.) So we concluded that Exchange is unstopped by It’s A Trap! Neither would you be able to use You Can’t Take This Guy From Me (a Surprise in Firefly Fluxx which has the same trigger as It’s A Trap).
What It’s A Trap! was designed to protect you against, in addition to Steal A Keeper, is any of those annoying other Keepers, like the Captain and the Scientist who can steal certain Keepers at will. One of my favorite things is to put out a juicy Crew Member and wait for the person with the Captain to try to take it, at which point, instead… It’s A Trap! and I get to steal their Captain instead!
For example, in Monty Python Fluxx, if I play Steal a Keeper, am I allowed to steal a Creeper instead?
Does a Keeper Limit allow me to discard creepers?
A: Keeper means Keeper, not Creeper. That’s why we changed the wording on “Trash a Keeper” to “Trash Something” so that it could mean both. But for “Steal a Keeper” it’s still just Keepers. Same with Exchange Keepers. It only applies to Keepers.
(I [Alison] wanted to name it “Trash a -eeper” but for some reason that didn’t fly.)
There is no limit to the number of Creepers you can have in front of you.
[In Star Trek Fluxx, Ensign Smith has the same function as the Expendable Crewman, and in Star Trek: TNG Fluxx, it’s Tasha Yar]
A: It all depends on who has the Expendable Crewman, and who played Exchange Keepers.
See this question in a video!
Our Friend The Expendable Crewman, Part 1
If the player who has the Expendable Crewman is the one who plays Exchange Keepers, they can choose to trade whatever they want. It’s only when someone else is taking a Keeper away from you that they must take/destroy the Expendable Crewman.
If, on the other hand, your opponent has the Expendable Crewman, and you play Exchange Keepers, you’ll be getting that dork in the red shirt, no matter what you’re actually coveting in your opponent’s collection.
Think of it this way: he readily obeys his own captain’s orders, but he always seems to leap forward at the last minute when a hostile force demands hostages!
A: Yes. “Plunder” has a very specific meaning in Pirate Fluxx, namely the power granted by the Plunder Rule. Steal a Keeper (and similar effects, like Exchange a Keeper) are not Plundering, they are stealing. So you CAN use the Steal a Keeper card to take away the Captain’s Hat as usual, but you can NOT take it with the free Plunder allowed by the Plunder rule.
This could happen with Double Agenda in effect. For example, in a 2-player game, if the goals are Star Gazing and Time is Money. Player A has The Eye and Time in play while Player B has The Cosmos and Money. Player A plays Exchange Keepers and exchanges The Eye for Money. Is the game over, with two winners, or must it continue until one and only one player has a winning condition?
This could also happen with 10 Cards In Hand
A: You would keep playing until only one player currently meets the win condition.