Guiltfeeder 
Creature — Horror
$1.43 #6805 0.50 24.3 years
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 similar to Guiltfeeder 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 Tresserhorn90%
$0.64↓#31458↓0.25↓30.2 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 2 life."
Abyssal Nightstalker84%
$0.49↓#27591↓0.27↓28.2 years↑
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Lim-Dûl's Paladin83%
$0.26↓#28954↓0.14↓30.2 years↑
"Whenever this creature attacks and isn't blocked, it assigns no combat damage this turn and defending player loses 4 life."
Suq'Ata Assassin82%
$0.54↓#22214↓0.32↓29.6 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
+1 more matching line
Swamp Mosquito82%
$0.14↓#19244↓0.07↓30.2 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Murk Dwellers82%
$0.06↓#31512↓0.20↓32.1 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Crypt Cobra81%
$0.16↓#28456↓0.75↑29.9 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Mindstab Thrull79%
$0.14↓#26925↓0.27↓31.8 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Elusive Tormentor // Insidious Mist78%
$0.21↓#20732↓0.07↓10.4 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Dauthi Mindripper77%
$0.28↓#22922↓0.33↓28.9 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Master of Cruelties76%
$4.25↑#3439↑1.15↑13.3 years↓
"Whenever this creature attacks a player and isn't blocked, that player's life total becomes 1. This creature assigns no combat damage this combat."
Eternal of Harsh Truths76%
$0.20↓#17782↓0.32↓9.1 years↓
"Whenever this creature attacks and isn't blocked, draw a card."
Cybermat73%
$0.25↓#12328↓0.562.9 years↓
"Whenever this creature attacks and isn't blocked, it gets +X/+0 until end of turn, where X is the number of attacking artifact creatures."
Prickly Boggart73%
$0.32↓#14724↓0.15↓18.6 years↓
"Fear"
Severed Legion73%
$0.09↓#26499↓0.00↓23.9 years
"Fear"
Lingering Tormentor73%
$0.65↓#15128↓0.22↓18.1 years↓
"Fear"
Dross Prowler73%
$0.05↓#30393↓0.38↓22.9 years↓
"Fear"
Razortooth Rats73%
$0.12↓#18632↓0.29↓29.2 years↑
"Fear"
Gluttonous Zombie73%
$0.06↓#29307↓0.00↓23.9 years
"Fear"
Squirming Mass73%
$0.14↓#28104↓0.5327.2 years↑
"Fear"