Rules FAQ
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You do not need to reveal the card you place in shadows. In fact, you are not allowed to look at the card until the entire effect resolves (unless something else allows you to).
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If the card you place in shadows has the printed shadow keyword, it will end up having two instances of the shadow keyword while it is in shadows, possibly with different costs. When that card is brought out of shadows, you may choose which instance of the shadow keyword is used.