Cheapest priced copy (Strixhaven: School of Mages): $7.49 at Card Kingdom, near mint, their price list as of .
Blade Historian 
Creature — Human Cleric · 2/3 · Rare · Strixhaven: School of Mages · #334
Attacking creatures you control have double strike.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $6.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages Promos | 165p | Rare | $7.99 | $9.99 |
| Strixhaven: School of Mages Promos | 165s | Rare | — | $11.99 |
| Strixhaven: School of Mages | 165 | Rare | $7.49 | $6.99 |
| Strixhaven: School of Mages | 334 | Rare | $12.99 | $9.99 |
One ruling from Wizards of the Coast
- 16 April 2021If Blade Historian leaves the battlefield after first-strike combat damage has been dealt but before regular combat damage (perhaps because it attacked and was destroyed by first-strike combat damage), attacking creatures you control will lose double strike. A creature without double strike won’t deal regular combat damage if it already dealt first-strike damage that turn.