The correct answer is that this is Looking at Extra Cards. It’s very tempting to call this a Hidden Card Error, but the set of cards for Evolutionary Leap was complete after Duskwatch Recruiter was revealed, and since the cards were revealed and aren’t in a private zone, we can confirm which card was incorrectly added to the set. Amy receives a warning for Looking at Extra Cards. The additional fix is to randomize the unknown portion of the library, including Avacyn. Since the four cards are in a known place we want to preserve their location on the bottom of the deck. Setting those four cards aside, the rest of the deck is shuffled and they are replaced on the bottom.