Case of the Pilfered Proof

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Card Text

Whenever a Detective enters the battlefield under your control and whenever a Detective you control is turned face up, put a +1/+1 counter on it. <br> To solve — You control three or more Detectives. <em>(If unsolved, solve at the beginning of your end step.)</em> <br> Solved — If one or more tokens would be created under your control, those tokens plus a Clue token are created instead. <em>(It's an artifact with "2, Sacrifice this artifact: Draw a card.)</em>