Sell a Card
The house pays the same number it charges, so one figure does two jobs: it is what the house gives you today, and it is the floor under any price you would rather ask for yourself.
Sell every card of one colour to the house at once. You will see the list first.
You have no cards to sell. Packs are where a collection starts.
Offers from Players
Somebody else's card, at a price they chose. The floor beside each one is what the house was charging for that card when it was listed — a seller may ask more, never less.
Nobody is selling anything right now. An offer appears here the moment somebody lists a card.
The House's Shelf
Lose a card in hardcore and the house holds it. You have seven days to buy it back at the price you were quoted, then one more day where it is still yours alone to take. After that anyone can buy it, at the house's price on the day.
The house is holding nothing. Nobody has lost a card they did not buy back.
How the Market Is Doing
The numbers the build plan asks to watch: how much is for sale, how much has sold, and how far over the floor an offer typically sits.