Mind Stone {2}
Artifact
{T}: Add {C}.
{1}, {T}, Sacrifice this artifact: Draw a card.
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Cards that do something similar 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.
Liberty Prime, Recharged 87%
#7479
"{2}, {T}, Sacrifice an artifact: You get {E}{E} and draw a card."
Inventors' Fair 83%
$15.62#277
"{4}, {T}, Sacrifice this card: Search your library for an artifact card, reveal it, put it into your hand, then shuffle. Activate only if you control three or more artifacts."
+1 more matching line
The Gold Saucer 83%
$0.30#3684
"{3}, {T}, Sacrifice two artifacts: Draw a card."
+1 more matching line
Moonsilver Key 82%
$0.93#1629
"{1}, {T}, Sacrifice this artifact: Search your library for an artifact card with a mana ability or a basic land card, reveal it, put it into your hand, then shuffle."