Abyssal Horror 
Creature — Horror
$0.48 #24460 0.73 27.9 years
Flying
When this creature enters, target player discards two cards.
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Cards similar to Abyssal Horror 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.
Ebon Dragon98%
$8.13↑#278380.47↓29.3 years↑
"When this creature enters, you may have target opponent discard a card."
Ravenous Rats98%
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"When this creature enters, target opponent discards a card."
Corrupt Court Official98%
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"When this creature enters, target opponent discards a card."
Brutal Nightstalker98%
$0.63↑#31525↓0.53↓28.2 years
"When this creature enters, you may have target opponent discard a card."
Screeching Buzzard96%
$0.04↓#270620.42↓23.9 years↓
"Flying"
Liliana's Specter95%
$0.14↓#9807↑0.60↓16.1 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle94%
$0.15↓#4046↑0.29↓4.5 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend94%
$0.15↓#212690.31↓27.9 years
"When this creature enters, each opponent discards a card."
Burglar Rat94%
$0.22↓#2600↑0.30↓7.9 years↓
"When this creature enters, each opponent discards a card."
Stony-Voiced Goblins94%
$0.26↓#200090.00↓0.1 years↓
"When this creature enters, each opponent discards a card."
Hecteyes94%
$0.20↓#7595↑0.13↓1.2 years↓
"When this creature enters, each opponent discards a card."
Nezumi Informant94%
$0.38↓#4695↑0.26↓3.4 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple94%
$0.18↓#4589↑0.28↓5.6 years↓
"When this creature enters, each opponent discards a card."
Deception92%
$2.64↑#29551↓0.15↓27.3 years
"Target opponent discards two cards."
Mind Rot91%
$0.03↓#12522↑0.41↓29.3 years↑
"Target player discards two cards."
Mournwhelk90%
$0.29↓#249040.53↓18.9 years↓
"When this creature enters, target player discards two cards."
Tendrils of Despair89%
$0.16↓#268170.60↓29.2 years↑
"Target opponent discards two cards."
Psychic Symbiont88%
$0.06↓#243130.12↓8.1 years↓
"When this creature enters, target opponent discards a card and you draw a card."
Fell Specter88%
$0.34↓#4878↑0.41↓8.1 years↓
"When this creature enters, target opponent discards a card."
Ozai's Cruelty88%
$0.22↓#13687↑0.00↓0.8 years↓
"this card deals 2 damage to target player. That player discards two cards."