Amber Prison 
Artifact
$0.30 #23249 0.57 29.9 years
You may choose not to untap this artifact during your untap step.
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Cards similar to Amber Prison 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.
Phyrexian Gremlins90%
$1.05↑#30425↓0.33↓32.5 years↑
"
: Tap target artifact. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Rust Tick88%
$0.22↓#261840.71↑15.9 years↓
"
,
: Tap target artifact. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Entrancing Lyre88%
$0.10↓#231870.12↓6.6 years↓
"You may choose not to untap this artifact during your untap step."
+1 more matching line
Kill Switch87%
$4.30↑#16433↑0.6426.6 years↓
"
,
: Tap all other artifacts. They don't untap during their controllers' untap steps for as long as this artifact remains tapped."
Vedalken Certarch85%
$0.14↓#272510.44↓15.9 years↓
"
: Tap target artifact, creature, or land. Activate only if you control three or more artifacts."
Mana Leech85%
$0.20↓#30152↓0.5027.9 years↓
"
: Tap target land. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Mole Worms85%
$0.18↓#30057↓0.5331.3 years↑
"
: Tap target land. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Deserter's Quarters80%
$0.14↓#29480↓0.14↓12.3 years↓
"
,
: Tap target creature. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
+1 more matching line
Elder Druid78%
$0.23↓#261750.06↓31.3 years↑
"
,
: You may tap or untap target artifact, creature, or land."
Sand Squid78%
$0.57↑#258100.41↓26.9 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