Cheapest priced copy (Lorwyn Eclipsed): $0.35 at Card Kingdom, near mint, their price list as of .
Riverguard's Reflexes 
Instant · Common · Lorwyn Eclipsed · #33
Target creature gets +2/+2 and gains first strike until end of turn. Untap it.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Lorwyn Eclipsed | 33 | Common | $0.35 | $0.49 |