Anti-Magic Aura 
Enchantment — Aura
$0.25 #26459 0.17 32.3 years
Enchant creature
Enchanted creature can't be the target of spells and can't be enchanted by other Auras.
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Cards similar to Anti-Magic Aura 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.
Bartel Runeaxe90%
$20.52↑#304360.33↑32.3 years
"this card can't be the target of Aura spells."
Spectral Shield88%
$0.27↑#284500.00↓31.3 years↓
"Enchanted creature gets +0/+2 and can't be the target of spells."
+1 more matching line
Tetsuo Umezawa84%
$86.52↑#276460.06↓32.3 years
"this card can't be the target of Aura spells."
Artifact Ward74%
$0.57↑#263470.2032.5 years
"Enchanted creature can't be the target of abilities from artifact sources."
Song of Serenity74%
$0.23↓#292620.71↑28.2 years↓
"Creatures that are enchanted can't attack or block."
Skeletal Grimace72%
$0.19↓#17752↑0.00↓14.9 years↓
"Enchant creature"
Temple Thief70%
$0.09↓#290010.71↑6.6 years↓
"This creature can't be blocked by enchanted creatures or enchantment creatures."
Soul Channeling70%
$0.25#15812↑0.69↑26.9 years↓
"Enchant creature"