Cursecatcher 
Creature — Merfolk Wizard
Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {1}.
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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.
Judge's Familiar 100%
$0.24#5356
"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {1}."
Mausoleum Wanderer 99%
$0.34#6773
"Sacrifice this creature: Counter target instant or sorcery spell unless its controller pays {X}, where X is this creature's power."