Hellhole Rats 
Creature — Rat
$0.34 #23671 0.14 20.3 years
Haste
When this creature enters, target player discards a card. This creature deals damage to that player equal to that card's mana value.
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Cards similar to Hellhole Rats 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.
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$0.10↓#28999↓0.57↑17.3 years↓
"When this creature enters, target player reveals a card at random from their hand, then loses life equal to that card's mana value."
Ozai's Cruelty80%
$0.22↓#13687↑0.00↓0.8 years↓
"this card deals 2 damage to target player. That player discards two cards."
Scythe Specter78%
$0.23↓#13430↑0.69↑15.2 years↓
"Whenever this creature deals combat damage to a player, each opponent discards a card. Each player who discarded a card with the greatest mana value among cards discarded this way loses life equal to that mana value."
Brutal Nightstalker77%
$0.63↑#31525↓0.53↑28.2 years↑
"When this creature enters, you may have target opponent discard a card."
Ravenous Rats77%
$0.12↓#11730↑0.37↑28.2 years↑
"When this creature enters, target opponent discards a card."
Corrupt Court Official77%
$0.14↓#15922↑0.53↑27.3 years↑
"When this creature enters, target opponent discards a card."
Ignite Memories77%
$0.39↑#12653↑0.60↑19.9 years
"Target player reveals a card at random from their hand. this card deals damage to that player equal to that card's mana value."
Friendly Fire76%
$0.05↓#276450.25↑11.6 years↓
"Target creature's controller reveals a card at random from their hand. this card deals damage to that creature and that player equal to the revealed card's mana value."
Ebon Dragon76%
$8.13↑#278380.47↑29.3 years↑
"When this creature enters, you may have target opponent discard a card."
Abyssal Horror76%
$0.48↑#244600.73↑27.9 years↑
"When this creature enters, target player discards two cards."
Stony-Voiced Goblins74%
$0.26↓#200090.00↓0.1 years↓
"When this creature enters, each opponent discards a card."
Hecteyes74%
$0.20↓#7595↑0.131.2 years↓
"When this creature enters, each opponent discards a card."
Nezumi Informant74%
$0.38↑#4695↑0.26↑3.4 years↓
"When this creature enters, each opponent discards a card."
Elderfang Disciple74%
$0.18↓#4589↑0.28↑5.6 years↓
"When this creature enters, each opponent discards a card."
Virus Beetle74%
$0.15↓#4046↑0.29↑4.5 years↓
"When this creature enters, each opponent discards a card."
Cackling Fiend74%
$0.15↓#212690.31↑27.9 years↑
"When this creature enters, each opponent discards a card."
Burglar Rat74%
$0.22↓#2600↑0.30↑7.9 years↓
"When this creature enters, each opponent discards a card."
Liliana's Specter72%
$0.14↓#9807↑0.60↑16.1 years↓
"When this creature enters, each opponent discards a card."
Refuse // Cooperate72%
$0.16↓#16853↑0.079.1 years↓
"Refuse deals damage to target spell's controller equal to that spell's mana value."