Cheapest priced copy (Battlebond): $0.35 at Card Kingdom, near mint, their price list as of .
Claustrophobia 
Enchantment — Aura · Common · Magic Origins · #50
Enchant creature
When this Aura enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
10 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battlebond | 115 | Common | $0.35 | $0.49 |
| Duel Decks: Jace vs. Vraska | 27 | Common | $0.35 | — |
| Duel Decks: Merfolk vs. Goblins | 3 | Common | $0.35 | — |
| Game Night 2019 | 17 | Common | $0.35 | — |
| Game Night | 20 | Common | $0.35 | — |
| Iconic Masters | 45 | Common | $0.35 | $0.49 |
| Innistrad | 48 | Common | $0.35 | $0.49 |
| Magic 2014 | 46 | Common | $0.35 | $0.49 |
| Magic Origins | 50 | Common | $0.35 | $0.49 |
| The List | DDT-3 | Common | $0.35 | — |
2 rulings from Wizards of the Coast
- 22 June 2015The enchanted creature can still be untapped in other ways. Claustrophobia will remain attached, and the creature will continue to not untap during its controller's untap step.
- 22 June 2015Claustrophobia can target and enchant a tapped or untapped creature.