Marble Diamond 
Artifact
$0.18 #1121 0.47 29.9 years
This artifact enters tapped.
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Cards similar to Marble Diamond 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.
Sky Diamond100%
$0.23↑#794↑0.00↓29.9 years
"This artifact enters tapped."
Charcoal Diamond100%
$0.26↑#692↑0.00↓29.9 years
"This artifact enters tapped."
Moss Diamond100%
$0.21↑#4332↓0.4729.9 years
"This artifact enters tapped."
Fire Diamond100%
$0.24↑#709↑0.22↓29.9 years
"This artifact enters tapped."
Worn Powerstone96%
$0.32↑#574↑0.73↑27.9 years↓
"This artifact enters tapped."
Firemind Vessel96%
$0.18#4236↓0.29↓7.3 years↓
"This artifact enters tapped."
Azorius Signet96%
$0.27↑#215↑0.00↓20.3 years↓
"
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Orzhov Signet96%
$0.30↑#185↑0.12↓20.6 years↓
", : Add 
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Selesnya Signet96%
$0.44↑#10730.06↓21.0 years↓
", : Add 
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Boros Signet96%
$0.52↑#248↑0.4420.9 years↓
", : Add 
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Seashell Cameo95%
$0.25↑#25004↓0.00↓25.9 years↓
": Add or ."
: Add or ."
Tigereye Cameo95%
$0.19↑#21692↓0.33↓25.9 years↓
": Add or ."
: Add or ."
Obelisk of Esper94%
$0.20↑#13760↓0.07↓17.9 years↓
": Add , , or ."
: Add , , or ."
Obelisk of Bant94%
$0.17↓#19512↓0.80↑17.9 years↓
": Add , , or ."
: Add , , or ."
Obelisk of Naya94%
$0.22↑#18446↓0.00↓17.9 years↓
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: Add , , or ."
Star Compass93%
$0.32↑#4698↓0.00↓25.6 years↓
"This artifact enters tapped."
White Lotus Tile90%
$5.45↑#4040↓0.00↓0.8 years↓
"This artifact enters tapped."
Timeless Lotus90%
$2.98↑#2179↓0.14↓4.0 years↓
"this card enters tapped."
+1 more matching line
Empowered Autogenerator88%
$0.23↑#4060↓0.33↓7.0 years↓
"This artifact enters tapped."
Mana Prism88%
$0.18#24925↓0.00↓29.9 years
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: Add ."