Cheapest priced copy (Commander Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Swift Response 
Instant · Common · Core Set 2021 · #40
Destroy target tapped creature.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
3 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Masters | 64 | Common | $0.35 | $0.49 |
| Foundations Jumpstart | 269 | Common | $0.35 | — |
| Core Set 2021 | 40 | Common | $0.35 | $0.49 |