Lurking Roper 

Creature — Horror
$0.07 #24864 0.47 5.1 years
This creature doesn't untap during your untap step.
Whenever you gain life, untap this creature.
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Cards similar to Lurking Roper 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
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"At the beginning of your upkeep, you may pay
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"Whenever you become the target of a spell, you may untap this creature."
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"Whenever this creature is dealt damage, untap it."
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"Whenever you cast a nonred spell, untap this creature."
+1 more matching line