Cards not currently in play exist in one of several out-of-play zones. Out-of-play cards can be hidden from one or both players depending on which out-of-play zone they occupy:
Archives: A player may look at the cards in their archives at any time. A player cannot look at the cards in their opponent’s archives.
Deck: Cards in a deck cannot be viewed by either player during a game.
Discard Pile: Cards in discard piles are faceup and may be viewed by either player at any time. The order of the cards in the discard pile must be maintained.
Hand: A player can view the cards in their hand at any time, but they cannot view the cards in their opponent’s hand.
Purged: Purged cards are kept faceup and may be viewed by either player at any time.
Card abilities may create additional out-of-play zones. Unless otherwise specified, if a card ability instructs that a card be placed “facedown,” it can only be viewed by the player who controls the card. This also applies to cards that are placed facedown under other cards; they can only be viewed by the controller of the card that the facedown card is under.
Related Topic: In-Play Zone