Clarion Conqueror 
Creature — Dragon
$1.87 #6418 1.10 1.4 years
Flying
Activated abilities of artifacts, creatures, and planeswalkers can't be activated.
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Cards similar to Clarion Conqueror 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.
Stony Silence90%
$0.50↓#61061.35↑14.9 years↑
"Activated abilities of artifacts can't be activated."
Damping Matrix87%
$0.72↓#15507↓1.25↑22.9 years↑
"Activated abilities of artifacts and creatures can't be activated unless they're mana abilities."
Collector Ouphe86%
$2.20↑#2431↑1.55↑7.2 years↑
"Activated abilities of artifacts can't be activated."
Null Rod85%
$113.87↑#8938↓1.53↑29.2 years↑
"Activated abilities of artifacts can't be activated."
Windborn Muse82%
$0.48↓#999↑0.87↓23.6 years↑
"Flying"
Doorkeeper Thrull81%
$0.66↓#69761.072.6 years↑
"Flying"
Tomik, Distinguished Advokist76%
$0.28↓#11003↓0.20↓7.3 years↑
"Flying"
Linvala, Keeper of Silence74%
$18.85↑#2590↑1.47↑16.4 years↑
"Activated abilities of creatures your opponents control can't be activated."
Karn, the Great Creator74%
$2.65↑#2079↑1.61↑7.3 years↑
"Activated abilities of artifacts your opponents control can't be activated."
Wizened Snitches73%
$0.28↓#14590↓0.93↓20.9 years↑
"Flying"