Rachel, the Ancient Library Researcher (ABC-BG-042 R) [Arcana Battle Colosseum]

When this card enters the field -> Look at the top three cards of target player's deck. Put any number of them into their owner's graveyard and the rest on the top of their owner's deck in any order. When this card leaves the field -> Search your deck for a card and put it into your hand. Then shuffle your deck.