Cheapest priced copy (Champions of Kamigawa): $0.35 at Card Kingdom, near mint, their price list as of .
Mystic Restraints 
Enchantment — Aura · Common · Champions of Kamigawa · #76
Flash
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champions of Kamigawa | 76 | Common | $0.35 | $0.49 |