Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Armament of Nyx 
Enchantment — Aura · Common · Journey into Nyx · #4
Enchant creature
Enchanted creature has double strike as long as it's an enchantment. Otherwise, prevent all damage that would be dealt by enchanted creature. (A creature with double strike deals both first-strike and regular combat damage.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 4 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 26 April 2014Armament of Nyx continuously checks to see whether the creature it's enchanting is an enchantment or not. If the creature isn't an enchantment and becomes one, or it is an enchantment and stops being one, the effect will change.