Cheapest priced copy (Adventures in the Forgotten Realms): $0.35 at Card Kingdom, near mint, their price list as of .
Ray of Enfeeblement 
Instant · Uncommon · Adventures in the Forgotten Realms · #116
Target creature gets -4/-1 until end of turn. If that creature is white, it gets -4/-4 until end of turn instead.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Adventures in the Forgotten Realms | 116 | Uncommon | $0.35 | $0.49 |