Cheapest priced copy (March of the Machine): $0.35 at Card Kingdom, near mint, their price list as of .
War Historian 
Creature — Human Monk · 3/3 · Common · March of the Machine · #214
Reach
This creature has indestructible as long as it attacked a battle this turn.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine | 214 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 14 April 2023War Historian's last ability starts to apply as soon as it's declared as an attacker that's attacking a battle, and it applies for the entire turn. It doesn't matter what happens to the battle after that point.