Boros Cluestone 
Artifact
{T}: Add {R} or {W}.
{R}{W}, {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.
Mardu Banner 83%
$0.11#10002
"{R}{W}{B}, {T}, Sacrifice this artifact: Draw a card."
+1 more matching line