Guiltfeeder {3}{B}{B}
Creature — Horror
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Whenever this creature attacks and isn't blocked, defending player loses 1 life for each card in their graveyard.
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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.
Keeper of Tresserhorn 96%
$0.64#31165
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Lim-Dûl's Paladin 95%
$0.26#28541
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Delta Bloodflies 93%
$0.19#16152
"Whenever this creature attacks, if you control a creature with a counter on it, each opponent loses 1 life."
Ravenloft Adventurer 93%
$0.36#5509
"Whenever this creature attacks, if you've completed a dungeon, defending player loses 1 life for each card they own in exile with a hit counter on it."
Calculating Lich 91%
$0.73#12897
"Whenever a creature attacks one of your opponents, that player loses 1 life."
+1 more matching line
Blood Reckoning 91%
$0.21#12059
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Marchesa's Decree 91%
$3.64#7127
"Whenever a creature attacks you or a planeswalker you control, that creature's controller loses 1 life."
Thornbow Archer 90%
$0.08#14509
"Whenever this creature attacks, each opponent who doesn't control an Elf loses 1 life."
Cryptolith Fragment // Aurora of Emrakul 86%
$0.27#4720
"Whenever this creature attacks, each opponent loses 3 life."
Emissary of Despair 85%
$0.14#20389
"Whenever this creature deals combat damage to a player, that player loses 1 life for each artifact they control."
Spiteful Returned 85%
$0.23#21719
"Whenever this creature or enchanted creature attacks, defending player loses 2 life."
Glass Asp 82%
$0.17#27109
"Whenever this creature deals combat damage to a player, that player loses 2 life at the beginning of their next draw step unless they pay {2} before that step."
Nafs Asp 82%
$0.09#28687
"Whenever this creature deals damage to a player, that player loses 1 life at the beginning of their next draw step unless they pay {1} before that draw step."