Card text
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Official rulings
3 rulings · in English, source ScryfallThe cards are face down all the time. You can’t look at them. This applies even to cards from your hand that got swapped out. You have to remember what they were if you care.
2004-10-04 · Wizards of the CoastTaking control of another player’s Duplicity will trigger the ability that causes the cards they exiled to be put into their owner’s graveyard.
2008-04-01 · Wizards of the CoastFor a time the last ability triggered when Duplicity left the battlefield. It has been restored to triggering when you lose control of Duplicity.
2008-04-01 · Wizards of the CoastAll printings