Karn, Argent Defender 
Legendary Artifact Creature — Golem
$0.51 #20874 1.30 0.0 years
Artifacts and creatures entering the battlefield don't cause abilities to trigger.
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Cards similar to Karn, Argent Defender 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.
Doorkeeper Thrull97%
$0.80↑#7232↑1.292.7 years↑
"Artifacts and creatures entering don't cause abilities to trigger."
Tocatli Honor Guard90%
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"Creatures entering don't cause abilities to trigger."
Torpor Orb88%
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"Creatures entering don't cause abilities to trigger."
Hushwing Gryff86%
$0.36↓#11545↑0.94↓12.3 years↑
"Creatures entering don't cause abilities to trigger."
Hushbringer82%
$0.44↓#4036↑1.377.0 years↑
"Creatures entering or dying don't cause abilities to trigger."
Elesh Norn, Mother of Machines80%
$23.11↑#1049↑1.92↑3.7 years↑
"Permanents entering don't cause abilities of permanents your opponents control to trigger."