Old Man of the Sea {1}{U}{U}
Creature — Djinn
You may choose not to untap this creature during your untap step.
{T}: Gain control of target creature with power less than or equal to this creature's power for as long as this creature remains tapped and that creature's power remains less than or equal to this creature's power.
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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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"You may choose not to untap this creature during your untap step."
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"You may choose not to untap this creature during your untap step."
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"You may choose not to untap this creature during your untap step."
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"You may choose not to untap this creature during your untap step."