Nemesis of Reason 
Creature — Leviathan Horror
$3.08 #4630 0.68 17.5 years
Whenever this creature attacks, defending player mills ten cards.
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Cards similar to Nemesis of Reason 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.
Specimen Freighter82%
$0.26↓#14616↓0.07↓1.2 years↓
"Whenever this Spacecraft attacks, defending player mills four cards."
Screaming Phantom82%
$0.13↓#22688↓0.00↓2.9 years↓
"Whenever this creature attacks, mill a card."
Mysterio's Phantasm82%
$0.10↓#17595↓0.00↓1.1 years↓
"Whenever this creature attacks, mill a card."
Sphinx Mindbreaker82%
$3.42↑#15193↓0.31↓6.7 years↓
"When this creature enters, each opponent mills ten cards."
Terisian Mindbreaker81%
$1.15↓#48430.83↑3.9 years↓
"Whenever this creature attacks, defending player mills half their library, rounded up."
Lord Xander, the Collector80%
$2.70↓#7665↓1.24↑4.5 years↓
"Whenever this card attacks, defending player mills half their library, rounded down."
Nimana Skydancer80%
$0.08↓#23251↓0.05↓6.1 years↓
"When this creature enters, target opponent mills two cards."
Fleet Swallower80%
$1.10↓#51170.95↑9.1 years↓
"Whenever this creature attacks, target player mills half their library, rounded up."
Shriekgeist78%
$0.10↓#23923↓0.00↓14.7 years↓
"Whenever this creature deals combat damage to a player, that player mills two cards."
Imperious Mindbreaker78%
$0.37↓#14825↓0.50↓4.9 years↓
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""
Restless Reef76%
$1.87↓#42130.07↓2.9 years↓
"Whenever this land attacks, target player mills four cards."
Veteran Ice Climber76%
$0.20↓#14337↓0.07↓1.5 years↓
"Whenever this creature attacks, up to one target player mills cards equal to this creature's power."
Navigator's Ruin75%
$0.09↓#23360↓0.00↓9.1 years↓
"At the beginning of your end step, if you attacked this turn, target opponent mills four cards."
Mind Sculpt75%
$0.24↓#11836↓0.16↓14.3 years↓
"Target opponent mills seven cards."
Valakut Fireboar74%
$0.19↓#27800↓0.00↓16.5 years
"Whenever this creature attacks, switch its power and toughness until end of turn."
Reckless Pangolin74%
$0.23↓#31680↓0.00↓8.3 years↓
"Whenever this creature attacks, it gets +1/+1 until end of turn."
Graceful Cat74%
$0.14↓#25727↓0.00↓9.5 years↓
"Whenever this creature attacks, it gets +1/+1 until end of turn."
Benalish Veteran74%
$0.05↓#31359↓0.00↓15.3 years↓
"Whenever this creature attacks, it gets +1/+1 until end of turn."
Lurking Nightstalker74%
$0.25↓#31945↓0.07↓28.3 years↑
"Whenever this creature attacks, it gets +2/+0 until end of turn."
Vicious Kavu74%
$0.17↓#30947↓0.07↓26.0 years↑
"Whenever this creature attacks, it gets +2/+0 until end of turn."