Cheapest priced copy (Fourth Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Spirit Shackle 
Enchantment — Aura · Uncommon · Fourth Edition · #163
Enchant creature
Whenever enchanted creature becomes tapped, put a -0/-2 counter on it.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
4 printings · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fourth Edition Foreign Black Border | 163 | Uncommon | — | — |
| Fourth Edition | 163 | Uncommon | $0.35 | — |
| Legends | 117 | Common | $0.35 | — |
| Renaissance | 65 | Common | — | — |
One ruling from Wizards of the Coast
- 1 October 2009Spirit Shackle's ability triggers only when the enchanted creature changes from untapped to tapped. If Spirit Shackle enters attached to an already tapped creature, it won't do anything (until that creature untaps and becomes tapped again, that is).