Deserter's Quarters {2}
Artifact
You may choose not to untap this artifact during your untap step.
{6}, {T}: Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped.
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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.
Raft Security Officer 98%
$0.05#29391
"{2}, {T}: Tap target creature. This ability costs {1} less to activate if it targets a creature with power 3 or less."
Crown of Empires 97%
$0.12#19813
"{3}, {T}: Tap target creature. Gain control of that creature instead if you control artifacts named Scepter of Empires and Throne of Empires."
Hylda's Crown of Winter 94%
$0.50#5345
"{1}, {T}: Tap target creature. This ability costs {1} less to activate during your turn."
Spirit Shield 100%
$0.46#31083
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Ashnod's Battle Gear 100%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Entrancing Lyre 100%
$0.11#22944
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Tawnos's Weaponry 100%
#31343
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Amber Prison 100%
$0.39#23208
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Vedalken Shackles 100%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
Endoskeleton 100%
$0.22#27874
"You may choose not to untap this artifact during your untap step."
+1 more matching line