Cheapest priced copy (Jumpstart): $0.35 at Card Kingdom, near mint, their price list as of .
Narcolepsy 
Enchantment — Aura · Common · Rise of the Eldrazi · #79
Enchant creature
At the beginning of each upkeep, if enchanted creature is untapped, tap it.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart | 159 | Common | $0.35 | — |
| Modern Masters 2015 | 52 | Common | $0.35 | $0.49 |
| The List | ROE-79 | Common | $0.35 | — |
| Rise of the Eldrazi | 79 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 15 June 2010Narcolepsy’s triggered ability has an “intervening ‘if’ clause.” That means (1) the ability triggers only if the enchanted creature is untapped as any player’s upkeep begins, and (2) the ability does nothing if the enchanted creature is already tapped by the time it resolves.
- 15 June 2010Narcolepsy doesn’t keep the enchanted creature continually tapped. The creature untaps during its controller’s untap step as normal, then is tapped when Narcolepsy’s ability resolves during that upkeep. The creature may be tapped in response (for example, if it has an activated ability with {T} in its cost).