The Journalist

When The Journalist enters the battlefield,
you and target opponent play Four Questions
about the top card of that player's library. (That
player looks at the card, then you ask up to three
yes-or-no questions about the card that he or she
answers truthfully. You guess the card's
name—that's question four—and the player reveals
the card.) If you win, target opponent must
discard all nonland cards of the same name as
the revealed card, from their library.