Obsessive Pursuit {1}{B}
Enchantment
When this enchantment enters and at the beginning of your upkeep, you lose 1 life and create a Clue token. (It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Whenever you attack, put X +1/+1 counters on target attacking creature, where X is the number of permanents you've sacrificed this turn. If X is three or more, that creature gains lifelink until end of turn.
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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.
Balemurk Leech 82%
$0.32#7648
"Whenever an enchantment you control enters and whenever you fully unlock a Room, each opponent loses 1 life."
Hopeless Nightmare 81%
$0.34#5967
"When this enchantment enters, each opponent discards a card and loses 2 life."