Time Vault {2}
Artifact
This artifact enters tapped.
This artifact doesn't untap during your untap step.
If you would begin your turn while this artifact is tapped, you may skip that turn instead. If you do, untap this artifact.
{T}: Take an extra turn after this one.
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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.
Mana Vault 100%
$113.72#145
"This artifact doesn't untap during your untap step."
+2 more matching lines
Elaborate Firecannon 100%
$0.05#28481
"This artifact doesn't untap during your untap step."
+1 more matching line
Basalt Monolith 100%
$3.75#561
"This artifact doesn't untap during your untap step."
+1 more matching line
Grim Monolith 100%
$472.34#674
"This artifact doesn't untap during your untap step."
+1 more matching line
Ashnod's Battle Gear 95%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 95%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
Deserter's Quarters 95%
$0.05#29280
"You may choose not to untap this artifact during your untap step."
Helm of Possession 95%
$5.07#14749
"You may choose not to untap this artifact during your untap step."