Flowstone Armor {3}
Artifact
You may choose not to untap this artifact during your untap step.
{3}, {T}: Target creature gets +1/-1 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.
Entrancing Lyre 100%
$0.11#22944
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 100%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Deserter's Quarters 100%
$0.05#29280
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Helm of Possession 100%
$5.07#14749
"You may choose not to untap this artifact during your untap step."
Elaborate Firecannon 95%
$0.05#28481
"This artifact doesn't untap during your untap step."
+1 more matching line
Unwinding Clock 91%
$18.72#545
"Untap all artifacts you control during each other player's untap step."
Static Orb 90%
$14.92#5728
"As long as this artifact is untapped, players can't untap more than two permanents during their untap steps."
The Blackstaff of Waterdeep 89%
$0.20#19806
"You may choose not to untap this card during your untap step."