Rust Tick 
Artifact Creature — Insect
$0.22 #26184 0.71 15.9 years
You may choose not to untap this creature during your untap step.
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Cards similar to Rust Tick 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 Gremlins99%
$1.05↑#304250.33↓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
Kill Switch94%
$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."
Amber Prison88%
$0.30↑#232490.57↓29.9 years↑
"
,
: Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as this artifact remains tapped."
+1 more matching line
Hyperion Blacksmith80%
$2.15↑#31613↓0.26↓32.3 years↑
"
: You may tap or untap target artifact an opponent controls."
Roaring Slagwurm78%
$0.33↑#223750.44↓22.6 years↑
"Whenever this creature attacks, tap all artifacts."
Tumble Magnet78%
$0.08↓#265060.50↓15.9 years
"
, Remove a charge counter from this artifact: Tap target artifact or creature."
Vedalken Certarch76%
$0.14↓#272510.44↓15.9 years
"
: Tap target artifact, creature, or land. Activate only if you control three or more artifacts."
Janjeet Sentry72%
$0.09↓#217810.05↓9.9 years↓
"
, Pay 
: You may tap or untap target artifact or creature."