Slagstone Refinery 
Artifact
$0.19 #8558 0.41 3.9 years
Whenever this artifact or another nontoken artifact you control is put into a graveyard from the battlefield or is put into exile from the battlefield, create a tapped Powerstone token. (It's an artifact with "
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. This mana can't be spent to cast a nonartifact spell.")
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Cards similar to Slagstone Refinery 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.
Visions of Phyrexia77%
$0.31↑#90810.00↓3.9 years
"At the beginning of your end step, if you didn't play a card from exile this turn, create a tapped Powerstone token."
Geology Enthusiast75%
$0.31↑#16594↓0.06↓3.9 years
"At the beginning of your end step, create a tapped Powerstone token."
Urza, Powerstone Prodigy74%
$0.19#12540↓0.06↓3.9 years
"Whenever you discard one or more artifact cards, create a tapped Powerstone token. This ability triggers only once each turn."
Hall of Tagsin72%
$0.34↑#6299↑0.01↓3.9 years
", : Create a tapped Powerstone token."
, : Create a tapped Powerstone token."
Powerstone Engineer70%
$0.17↓#26277↓0.06↓3.9 years
"When this creature dies, create a tapped Powerstone token."
The Mana Rig70%
$0.48↑#17592↓0.07↓4.1 years
"Whenever you cast a multicolored spell, create a tapped Powerstone token."