Pensive Scarecrow

When Pensive Scarecrow enters the battlefield, search your library for up to three Plains cards, reveal them and exile them. Then shuffle your library.
If you would draw a card, reveal the top card of your library instead. You may exile it. If you do, put another card exiled with Pensive Scarecrow into your hand. Otherwise, put the revealed card into your hand.
Crows gone, its mind too.