Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Curse of Chains 
Enchantment — Aura · Common · Shadowmoor · #139
Enchant creature
At the beginning of each upkeep, tap enchanted creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $3.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 183 | Common | $0.35 | — |
| Shadowmoor | 139 | Common | $0.35 | $3.99 |