Rooftop Nuisance {2}{U}
Sorcery
Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.)
Tap target creature. It doesn't untap during its controller's next untap step.
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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.
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"Tap target creature. It doesn't untap during its controller's next untap step."
Rush of Ice 100%
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"Tap target creature. It doesn't untap during its controller's next untap step."
+1 more matching line
Take into Custody 100%
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"Tap target creature. It doesn't untap during its controller's next untap step."
Sleep of the Dead 100%
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"Tap target creature. It doesn't untap during its controller's next untap step."