Wall of Lost Thoughts 

Creature — Wall
$0.21 #13972 0.27 7.6 years
Defender (This creature can't attack.)
When this creature enters, target player mills four cards. (They put the top four cards of their library into their graveyard.)
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Cards similar to Wall of Lost Thoughts 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.
Returned Centaur98%
$0.04↓#21302↓0.11↓12.9 years↑
"When this creature enters, target player mills four cards."
Homarid Explorer98%
$0.08↓#24051↓0.71↑8.4 years
"When this creature enters, target player mills four cards."
Merrow Witsniper98%
$0.26↑#26272↓0.53↑18.6 years↑
"When this creature enters, target player mills a card."
Desperate Bloodseeker96%
$0.19↓#143920.00↓2.4 years↓
"When this creature enters, target player mills two cards."
Drownyard Amalgam92%
$0.18↓#20278↓0.274.9 years↓
"When this creature enters, target player mills three cards."
Watcher of the Wayside92%
$0.20↓#159770.211.4 years↓
"When this creature enters, target player mills two cards. You gain 2 life."
Gnawing Vermin92%
$0.28↑#10037↑0.47↑3.8 years↓
"When this creature enters, target player mills two cards."
Reito Sentinel90%
$0.27↑#163720.07↓4.5 years↓
"When this creature enters, target player mills three cards."
+1 more matching line
Merfolk Secretkeeper // Venture Deeper88%
$0.27↑#132580.13↓6.9 years
"Target player mills four cards."
Geralf's Mindcrusher88%
$0.23↑#137380.2914.6 years↑
"When this creature enters, target player mills five cards."