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Usually, in MTG, when you play a card that requires multiple players to do something, like "Each player sacrifices a creature", players make choices in "APNAP" (active player / non-active player) order (going around the table in normal turn order if it's multiplayer), and then the effect itself happens simultaneously.

How does this work with hidden information? You'd still choose first, but when do you reveal the hidden information? Take, for instance, an "Everybody discard" effect (e.g. Liliana of the Veil): if I activate the ability, I'm supposed to choose a card first — do I immediately show my card to the other players, or do I set it aside face-down until everyone has made a pick?

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You go in AP-NAP order around the table to choose a card. However, the actual act of discarding is considered simultaneous, which means the chosen cards are still in the hand, a hidden zone, until all are chosen. It is perfectly fine to, for example, set the chosen card aside face down until everyone has chosen one.

101.4. If multiple players would make choices and/or take actions at the same time, the active player (the player whose turn it is) makes any choices required, then the next player in turn order (usually the player seated to the active player‘s left) makes any choices required, followed by the remaining nonactive players in turn order. Then the actions happen simultaneously. This rule is often referred to as the ―Active Player, Nonactive Player (APNAP) order‖ rule. Example: A card reads “Each player sacrifices a creature.” First, the active player chooses a creature he or she controls. Then each of the nonactive players, in turn order, chooses a creature he or she controls. Then all creatures chosen this way are sacrificed simultaneously.

101.4a If an effect has each player choose a card in a hidden zone, such as his or her hand or library, those cards may remain face down as they‘re chosen. However, each player must clearly indicate which face-down card he or she is choosing.

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    I had that document right in front of me, too. Research fail! Then again, I think it's good to have this question on the site / google, for posterity.
    – Alex P
    Nov 23, 2011 at 4:31
  • @AlexP I too searched the comp rules, and concentrated too much on "spell resolution" ... Good find ~@Affe
    – Stephen
    Nov 23, 2011 at 13:44
  • Hmm interesting. So you could base your sacrifice as NAP on the decision of the AP, since it's not really simultaneous?
    – Bono
    Nov 20, 2015 at 22:19

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