To discard a card is to move it into your discard pile. This is done every turn during your Clean-up phase, but can also be done at other times as part of the effect of a card. Cards that you play that cause you to discard from your hand are often sifters, or give you some benefit in exchange for discarding, while cards that cause other players to discard from their hand are handsize attacks. There are several cards that do something when discarded from your play area (generally during Clean-up), and two cards, Tunnel and Faithful Hound, that have special effects when discarded at any other time. There are also several cards that can instruct you to look through your discard pile, though this is generally not allowed under other circumstances.
When a card is gained (through buying or otherwise), it goes to your discard pile, unless otherwise specified; however, this does not count as "discarding" the card. Chancellor, Scavenger, Trusty Steed, Messenger, and Possession also have effects that can move cards to a discard pile without officially "discarding" them.
 Official Rules
- Move a card from your hand to your discard pile.
- Sometimes a card will tell you to discard a card from another location, but by default discarded cards come from hands.
- You place the discarded card on top of your discard pile, face up.
- If you discard multiple cards at once, you do not need to reveal them all, just the one you put on top.
- You can count the number of cards in your deck at any time (without looking at the card fronts), but cannot look through or count your discard pile or another player's deck or discard pile.
- When interacting with a discard pile (e.g. with Harbinger), it is not necessary to keep it in the same order. The only thing that ever matters about that order is that the top card is public.
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