Guiltfeeder 
Creature — Horror
$1.34 #6926 0.39 24.4 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%
$0.58↓#31817↓0.07↓30.4 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↓#27803↓0.21↓28.3 years↑
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Lim-Dûl's Paladin83%
$0.27↓#29223↓0.00↓30.4 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%
$0.55↓#22683↓0.27↓29.7 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
+1 more matching line
Swamp Mosquito82%
$0.15↓#19522↓0.3130.4 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Murk Dwellers82%
$0.07↓#31790↓0.00↓32.2 years↑
"Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of combat."
Crypt Cobra81%
$0.17↓#28716↓0.11↓30.0 years↑
"Whenever this creature attacks and isn't blocked, defending player gets a poison counter."
Mindstab Thrull79%
$0.15↓#27252↓0.3932.0 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Dauthi Mindripper77%
$0.27↓#22973↓0.4429.0 years↑
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."
Elusive Tormentor // Insidious Mist76%
$0.24↓#21177↓0.00↓10.5 years↓
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, transform it."
. If you do, transform it."
Master of Cruelties76%
$4.42↑#3530↑1.14↑13.5 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%
$0.18↓#18127↓0.06↓9.3 years↓
"Whenever this creature attacks and isn't blocked, draw a card."
Cybermat73%
$0.32↓#12614↓0.25↓3.0 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."
Dawnhand Eulogist73%
$0.15↓#13734↓0.05↓0.7 years↓
"Menace"
Ophidian72%
$0.12↓#26764↓0.05↓29.4 years↑
"Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn."
Goblin Vandal72%
$0.24↓#23133↓0.10↓29.4 years↑
"Whenever this creature attacks and isn't blocked, you may pay 
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn."
Gluttonous Zombie72%
$0.06↓#29708↓0.00↓24.0 years
"Fear"
Razortooth Rats72%
$0.11↓#18940↓0.00↓29.4 years↑
"Fear"
Severed Legion72%
$0.05↓#26888↓0.05↓24.0 years
"Fear"
Squirming Mass72%
$0.14↓#28362↓0.00↓27.4 years↑
"Fear"