Sword Coast Serpent // Capsizing Wave 

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Creature — Serpent Dragon // Instant — Adventure
This creature can't be blocked as long as you've cast a noncreature spell this turn.
Return target creature to its owner's hand. (Then exile this card. You may cast the creature later from exile.)
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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.
Illvoi Infiltrator 95%
$0.11#19170
"This creature can't be blocked if you've cast two or more spells this turn."
Relic Runner 92%
$0.19#27597
"This creature can't be blocked if you've cast a historic spell this turn."