Hesitation {1}{U}
Enchantment
When a player casts a spell, sacrifice this enchantment and counter that spell.
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Cards that do something similar 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.
Lunar Force 90%
$0.25#20810
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."