Dreadhound 
Creature — Demon Dog
$0.18 #5714 0.25 4.9 years
When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.)
Whenever a creature dies or a creature card is put into a graveyard from a library, each opponent loses 1 life.
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Cards similar to Dreadhound 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.
Poison-Tip Archer90%
$0.54↑#1647↑0.338.1 years↑
"Whenever another creature dies, each opponent loses 1 life."
Black Widow, Daring Operative86%
$2.54↑#22783↓0.00↓0.2 years↓
"When this card enters, mill three cards."
+1 more matching line
Polluted Cistern // Dim Oubliette85%
$0.40↑#62830.221.9 years↓
"Whenever one or more cards are put into your graveyard from your library, each opponent loses 1 life for each card type among those cards."
+1 more matching line
Excavation Mole84%
$0.14↓#25898↓0.196.4 years↑
"When this creature enters, mill three cards."
Venomous Hierophant84%
$0.09↓#21461↓0.00↓6.6 years↑
"When this creature enters, mill three cards."
Necromancer's Assistant84%
$0.07↓#23075↓0.00↓12.1 years↑
"When this creature enters, mill three cards."
Sultai Skullkeeper82%
$0.03↓#28178↓0.43↑11.6 years↑
"When this creature enters, mill two cards."
Venomized Cat82%
$0.20↑#13051↓0.301.0 years↓
"When this creature enters, mill two cards."
Screeching Skaab82%
$0.03↓#23628↓0.13↓14.6 years↑
"When this creature enters, mill two cards."
Wailing Ghoul82%
$0.12↓#19699↓0.09↓10.1 years↑
"When this creature enters, mill two cards."
Armored Skaab82%
$0.40↑#22013↓0.2514.9 years↑
"When this creature enters, mill four cards."
Laboratory Brute82%
$0.04↓#26314↓0.2010.1 years↑
"When this creature enters, mill four cards."
Ultron the Annihilator82%
$20.38↑#13805↓0.00↓0.2 years↓
"Whenever another artifact is put into your graveyard from the battlefield or an artifact card is put into your graveyard from anywhere other than the battlefield, each opponent loses 1 life."
Mineshaft Spider82%
$0.21↑#19625↓0.272.8 years↓
"When this creature enters, you may mill two cards."
Deathcap Marionette82%
$0.16↓#10955↓0.00↓2.8 years↓
"When this creature enters, you may mill two cards."
Scarblade Scout78%
$0.20↑#14024↓0.00↓0.6 years↓
"When this creature enters, mill two cards."
Marionette Apprentice78%
$2.51↑#562↑0.322.2 years↓
"Whenever another creature or artifact you control is put into a graveyard from the battlefield, each opponent loses 1 life."
Crawling Sensation78%
$0.22↑#3046↑0.13↓10.4 years↑
"At the beginning of your upkeep, you may mill two cards."
Crawling Infestation76%
$0.24↑#4540↑0.14↓4.8 years
"Whenever one or more creature cards are put into your graveyard from anywhere during your turn, create a 1/1 green Insect creature token. This ability triggers only once each turn."
+1 more matching line
Sidisi, Brood Tyrant76%
$1.34↑#3524↑0.37↑11.9 years↑
"Whenever one or more creature cards are put into your graveyard from your library, create a 2/2 black Zombie creature token."
+1 more matching line