Slumbering Cerberus 

Creature — Dog
$0.17 #20403 0.00 1.9 years
This creature doesn't untap during your untap step.
Morbid — At the beginning of each end step, if a creature died this turn, untap this creature.
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Cards similar to Slumbering Cerberus 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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"This creature doesn't untap during your untap step."
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"This creature doesn't untap during your untap step."
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"Whenever a creature dies, untap this creature."
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"this card doesn't untap during your untap step if you control a Reflection."