Deserter's Quarters 
Artifact
$0.17 #29809 0.32 12.5 years
You may choose not to untap this artifact during your untap step.
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Cards similar to Deserter's Quarters 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.
Sand Squid98%
$0.59↑#262240.2727.0 years↑
"
: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Entrancing Lyre93%
$0.11↓#23486↑0.18↓6.7 years↓
"
,
: Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
+1 more matching line
Rimescale Dragon89%
$3.58↑#22806↑0.4120.2 years↑
"
: Tap target creature and put an ice counter on it."
Dungeon Geists88%
$0.16↓#18456↑0.60↑14.7 years↑
"When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control this creature."