Carnival of Souls 
Enchantment
$22.62 #12433 0.56 27.4 years
Whenever a creature enters, you lose 1 life and add .
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Cards similar to Carnival of Souls 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.
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"Whenever another creature enters, its controller loses 1 life."