Rules FAQ
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You do not have to reveal the cards.
- Oldtown Undercity triggers off of duplicates coming out of shadows.
Oldtown.
Shadow (2).
Reaction: After a card you control comes out of shadows, look at the top 3 cards of your deck. Add 1 to your hand, place 1 on the bottom of your deck, and place the other on top of your deck. (Limit once per phase.)
Link: Decklists
Rules FAQ
You do not have to reveal the cards.