Mage-Ring Responder 
Artifact Creature — Golem
This creature doesn't untap during your untap step.
{7}: Untap this creature.
Whenever this creature attacks, it deals 7 damage to target creature defending player controls.
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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.
Colossus of Sardia 97%
#22807
"{9}: Untap this creature. Activate only during your upkeep."
+1 more matching line