Worn Powerstone 
Artifact
$0.32 #574 0.73 27.9 years
This artifact enters tapped.
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Cards similar to Worn Powerstone 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.
Firemind Vessel100%
$0.18↓#4236↓0.29↓7.3 years↓
"This artifact enters tapped."
Sisay's Ring98%
$0.31↓#4882↓0.29↓29.6 years↑
": Add ."
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Ur-Golem's Eye98%
$0.35↑#7639↓0.00↓22.6 years↓
": Add ."
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Thran Dynamo98%
$2.12↑#201↑0.41↓27.2 years
": Add ."
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Sky Diamond96%
$0.23↓#794↓0.00↓29.9 years↑
"This artifact enters tapped."
Charcoal Diamond96%
$0.26↓#692↓0.00↓29.9 years↑
"This artifact enters tapped."
Moss Diamond96%
$0.21↓#4332↓0.47↓29.9 years↑
"This artifact enters tapped."
Fire Diamond96%
$0.24↓#709↓0.22↓29.9 years↑
"This artifact enters tapped."
Marble Diamond96%
$0.18↓#1121↓0.47↓29.9 years↑
"This artifact enters tapped."
Sol Ring96%
$1.48↑#1↑1.46↑33.1 years↑
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White Lotus Tile96%
$5.45↑#4040↓0.00↓0.8 years↓
"This artifact enters tapped."
Empowered Autogenerator95%
$0.23↓#4060↓0.33↓7.0 years↓
"This artifact enters tapped."
The Eternity Elevator94%
$2.06↑#1687↓0.19↓1.1 years↓
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Prismatic Geoscope93%
$1.42↑#16640↓0.00↓9.8 years↓
"This artifact enters tapped."
Timeless Lotus93%
$2.98↑#2179↓0.14↓4.0 years↓
"this card enters tapped."
Arc Reactor92%
$1.19↑#6756↓0.00↓0.2 years↓
"This artifact enters tapped."
+1 more matching line
Weaver of Currents90%
$0.11↓#17980↓0.00↓9.4 years↓
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Sunastian Falconer90%
$3.79↑#28801↓0.07↓32.3 years↑
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Palladium Myr90%
$0.35↑#742↓0.12↓15.9 years↓
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Kozilek's Channeler90%
$0.27↓#7128↓0.07↓10.9 years↓
": Add ."
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