If an effect has each player choose a card in a hidden zone, such as their hand or library, those cards may remain face down as they’re chosen. However, each player must clearly indicate which face-down card they are choosing.
January 25, 2019 · Ravnica Allegiance
If an effect has each player choose a card in a hidden zone, such as their hand or library, those cards may remain face down as they're chosen. However, each player must clearly indicate which face-down card they are choosing.
April 27, 2018 · Dominaria
If an effect has each player choose a card in a hidden zone, such as their hand or library, those cards may remain face down as they’re chosen. However, each player must clearly indicate which face-down card they are choosing.
February 1, 2014 · Born of the Gods
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.
September 30, 2011 · Innistrad
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.
June 17, 2011 · Commander 2011
If an effect has each player choose a card in a hidden zone, such as his or her hand or library,
April 1, 2011 · Duel Decks: Knights vs. Dragons
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.
February 4, 2011 · Mirrodin Besieged
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.
October 1, 2010 · Scars of Mirrodin
If an effect has each player choose a card in a hidden zone, such as his or her hand or library,
February 1, 2010 · Worldwake
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.