Slumbering Cerberus 
Creature — Dog
$0.17 #20335 0.05 1.8 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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"At the beginning of your upkeep, you may pay . If you do, untap this creature."
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"At the beginning of your upkeep, you may pay . If you do, untap this creature."
. If you do, untap this creature."+1 more matching line