Siren Stormtamer 
Creature — Siren Pirate Wizard
Flying
{U}, Sacrifice this creature: Counter target spell or ability that targets you or a creature you control.
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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.
Fugitive Droid 89%
$0.29#12875
"{U}, Sacrifice this creature: Counter target spell that targets an artifact or creature you control."
Wizard Replica 84%
$0.40#21595
"{U}, Sacrifice this creature: Counter target spell unless its controller pays {2}."
+1 more matching line
Glen Elendra Archmage 84%
$10.88#1642
"{U}, Sacrifice this creature: Counter target noncreature spell."
Malevolent Hermit // Benevolent Geist 83%
$1.55#4201
"{U}, Sacrifice this creature: Counter target noncreature spell unless its controller pays {3}."