Cheapest priced copy (Coldsnap): $0.35 at Card Kingdom, near mint, their price list as of .
Rune Snag 
Instant · Common · Ultimate Masters · #68
Counter target spell unless its controller pays {2} plus an additional {2} for each card named Rune Snag in each graveyard.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Coldsnap | 46 | Common | $0.35 | $0.79 |
| Ultimate Masters | 68 | Common | $0.35 | $0.49 |