Lionel, the Liar's Chair

Ward - Discard a Card
Whenever you cast or copy an instant or sorcery
spell, target opponent chooses a card in their
hand and tells you a name for it. You choose to
believe or disbelieve what they tell you. That
player then reveals the chosen card and if the
card isn't the name they gave you, and you
disbelieved them, they discard it. If the chosen
card is the name they claimed, and you believed
them, they discard it the same.