Cheapest priced copy (Dragon's Maze): $0.35 at Card Kingdom, near mint, their price list as of .
Runner's Bane 
Enchantment — Aura · Common · Dragon's Maze · #17
Enchant creature with power 3 or less
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Dragon's Maze | 17 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 April 2013The enchanted creature can still be untapped in other ways, such as by Aurelia, the Warleader.
- 15 April 2013If the enchanted creature's power increases to 4 or greater, Runner's Bane will be put into its owner's graveyard as a state-based action.