Orzhov Cluestone 
Artifact
{T}: Add {W} or {B}.
{W}{B}, {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.
Abzan Banner 85%
$0.20#15423
"{W}{B}{G}, {T}, Sacrifice this artifact: Draw a card."
+1 more matching line
Mardu Banner 82%
$0.11#10002
"{R}{W}{B}, {T}, Sacrifice this artifact: Draw a card."
+1 more matching line