Andrea is playing against Nick in a Standard PPTQ. Andrea, who has delerium, taps 3 Swamps and casts Pick the Brain targeting Nick. Nick lets it resolve and reveals his hand. Andrea selects Aetherworks Marvel, writes down the contents of Nick’s hand, then starts searching his library. After exiling all the copies, she scoops up Nick’s library and his revealed hand and begins to shuffle them together. Nick gasps “What are you doing? Judge!”
What do you do ?
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Andrea receives a Warning for Game Rules Violation. After confirming that the written down hand is correct, retrieve copies of those cards from Nick’s library, and those cards become Nick’s hand. Then have Nick shuffle his library.