Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Estwald Shieldbasher 
Creature — Human Soldier · 4/2 · Common · Innistrad: Crimson Vow · #11
Whenever this creature attacks, you may pay {1}. If you do, it gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 278 | Common | $0.35 | $0.49 |
| Innistrad: Crimson Vow | 11 | Common | $0.35 | $0.49 |