Dryad's Revival reveals card
The text on the card "Dryad's Revival" doesn't say that you have to reveal the returned card, but if it is played in MTG Arena the returned card is incorrectly revealed.
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[Deleted User] commented
The graveyard is a zone where all cards are known to both players. You can’t possibly put a card in your hand from your graveyard without your opponent knowing which one it is as you have to target it anyway