Foul Spirit {2}{B}
Creature — Spirit
Flying
When this creature enters, sacrifice a land.
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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.
Excavating Anurid 84%
$0.22#19130
"When this creature enters, you may sacrifice a land. If you do, draw a card."
Springbloom Druid 82%
$0.38#766
"When this creature enters, you may sacrifice a land. If you do, search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle."