Armament of Nyx 
Enchantment — Aura
$0.04 #22370 0.31 12.3 years
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.)
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Cards similar to Armament of Nyx expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Nyx Infusion96%
$0.05↑#29418↓0.00↓12.3 years
"Enchant creature"
Serra's Boon86%
$0.22↑#29390↓0.2519.6 years↑
"Enchant creature"
Gift of Fangs85%
$0.21↑#14629↑0.60↑4.8 years↓
"Enchant creature"
Tahngarth's Rage84%
$0.19↑#265670.00↓28.9 years↑
"Enchant creature"
Dog Umbra79%
$0.22↑#7066↑0.282.2 years↓
"Enchant creature"
Battle Mastery74%
$0.24↑#4530↑0.13↓18.9 years↑
"Enchanted creature has double strike."
Twinblade Geist // Twinblade Invocation74%
$0.18↑#14182↑0.12↓4.8 years↓
"Enchanted creature has double strike."
Twinblade Blessing74%
$0.21↑#4818↑0.21↓1.8 years↓
"Enchanted creature has double strike."
Runes of the Deus72%
$0.34↑#12722↑0.00↓18.3 years↑
"Enchant creature"
Defang70%
$0.14↑#222960.14↓14.3 years↑
"Prevent all damage that would be dealt by enchanted creature."