Cheapest priced copy (Iconic Masters): $0.35 at Card Kingdom, near mint, their price list as of .
Guard Duty 
Enchantment — Aura · Common · Rise of the Eldrazi · #23
Enchant creature
Enchanted creature has defender.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Iconic Masters | 22 | Common | $0.35 | $0.49 |
| Rise of the Eldrazi | 23 | Common | $0.35 | $0.49 |