Cheapest priced copy (Dominaria): $0.35 at Card Kingdom, near mint, their price list as of .
Urza's Tome 
Artifact — Book · Uncommon · Dominaria · #235
{3}, {T}: Draw a card. Then discard a card unless you exile a historic card from your graveyard. (Artifacts, legendaries, and Sagas are historic.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dominaria | 235 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 27 April 2018A 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.
- 27 April 2018You don’t choose whether to discard or exile a card from your graveyard until after you see the card you draw.
- 27 April 2018You can choose to discard a card even if there’s a historic card in your graveyard you could exile.