Wretched Gryff {7}
Creature — Eldrazi Hippogriff
Emerge {5}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast this spell, draw a card.
Flying
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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.
Jeskai Ascendancy 90%
$1.36#2926
"Whenever you cast a noncreature spell, you may draw a card. If you do, discard a card."
Vega, the Watcher 89%
$0.32#2738
"Whenever you cast a spell from anywhere other than your hand, draw a card."