Riddleform 

Enchantment
$0.06 #26116 0.22 9.3 years
Whenever you cast a noncreature spell, you may have this enchantment become a 3/3 Sphinx creature with flying in addition to its other types until end of turn.
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Cards similar to Riddleform 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.
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: This artifact becomes a 3/3 Construct artifact creature with flying until end of turn."
+1 more matching line
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"At the beginning of your end step, if you descended this turn, scry 1."