Azorius Keyrune {3}
Artifact
{T}: Add {W} or {U}.
{W}{U}: This artifact becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.
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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.
Ojutai Monument 91%
$0.14#20663
"{4}{W}{U}: This artifact becomes a 4/4 white and blue Dragon artifact creature with flying until end of turn."
+1 more matching line