Riddleform 

Enchantment
$0.10 #26414 0.06 9.1 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.
Halcyon Glaze92%
$0.17↑#303330.27↑20.9 years↑
"Whenever you cast a creature spell, this enchantment becomes a 4/4 Illusion creature with flying in addition to its other types until end of turn."
Machine Man, Model X-5184%
$0.24↑#261530.000.2 years↓
"Whenever you cast a noncreature spell, put a +1/+1 counter on this card and he gains flying until end of turn."
Iron Suitcase83%
$0.29↑#239170.000.2 years↓
"
: This artifact becomes a 3/3 Construct artifact creature with flying until end of turn."
+1 more matching line
Mistfire Adept80%
$0.07↓#18407↑0.0511.6 years↑
"Whenever you cast a noncreature spell, target creature gains flying until end of turn."