Night Market Lookout 
Creature — Human Rogue
Whenever this creature becomes tapped, each opponent loses 1 life and you gain 1 life.
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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.
Bontu's Monument 86%
$8.37#664
"Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life."
Gloom Sower 86%
$0.21#20542
"Whenever this creature becomes blocked by a creature, that creature's controller loses 2 life and you gain 2 life."
Soul Enervation 82%
$0.31#10741
"Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life."
Undead Hand Ninja 82%
$1.41#23767
"Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life."
Revenge of Ravens 82%
$0.48#2802
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life and you gain 1 life."
Psychomancer 82%
$1.06#8776
"Whenever this creature or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, target opponent loses 1 life and you gain 1 life."
Knights of the Black Rose 81%
$0.35#11544
"Whenever an opponent becomes the monarch, if you were the monarch as the turn began, that player loses 2 life and you gain 2 life."
Reaper's Talisman 81%
$0.12#13011
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."