Spectral Shield 
Enchantment — Aura
$0.27 #28450 0.00 31.3 years
Enchant creature
Enchanted creature gets +0/+2 and can't be the target of spells.
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Cards similar to Spectral Shield 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.
Anti-Magic Aura88%
$0.25↓#264590.17↑32.3 years↑
"Enchanted creature can't be the target of spells and can't be enchanted by other Auras."
Artifact Ward76%
$0.57↑#263470.20↑32.5 years↑
"Enchanted creature can't be the target of abilities from artifact sources."