What does Shelldock Isle do?
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Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)\nShelldock Isle enters tapped.\n{T}: Add {U}.\n{U}, {T}: You may play the exiled card without paying its mana cost if a library has twenty or fewer cards in it.
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