Urza's Tome

Oracle Text

3, T: Draw a card. Then discard a card unless you exile a historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.)

Card Rulings

4/27/2018 You don’t choose whether to discard or exile a card from your graveyard until after you see the card you draw.
4/27/2018 You can choose to discard a card even if there’s a historic card in your graveyard you could exile.
4/27/2018 A card, spell, or permanent is historic if it has the legendary supertype, the artifact card type, or the Saga subtype. Having two of those qualities doesn’t make an object more historic than another or provide an additional bonus—an object either is historic or it isn’t.

Additional Information