Cheapest priced copy (Outlaws of Thunder Junction): $0.35 at Card Kingdom, near mint, their price list as of .
Bristlepack Sentry 
Creature — Plant Wolf · 3/3 · Common · Outlaws of Thunder Junction · #156
Defender
As long as you control a creature with power 4 or greater, this creature can attack as though it didn't have defender.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 156 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 12 April 2024If you raise Bristlepack Sentry’s power to 4 or greater, it fulfills its own condition and it can attack as though it didn’t have defender.
- 12 April 2024Once Bristlepack Sentry has legally attacked, causing its last ability to not apply by removing other creatures from the battlefield or reducing the power of one or more creatures won’t cause Bristlepack Sentry to stop attacking.