Mana Vault 
Artifact
$87.31 #146 1.63 33.1 years
This artifact doesn't untap during your untap step.
At the beginning of your upkeep, you may pay
. If you do, untap this artifact.
At the beginning of your draw step, if this artifact is tapped, it deals 1 damage to you.
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Cards similar to Mana Vault 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.
Grim Monolith98%
$478.32↑#673↓1.42↓27.6 years↓
"This artifact doesn't untap during your untap step."
+2 more matching lines
Basalt Monolith98%
$3.70↓#564↓1.19↓33.1 years
"This artifact doesn't untap during your untap step."
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Brass Man90%
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"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
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Brass Gnat90%
$0.08↓#23166↓0.27↓19.9 years↓
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Phyrexian Ironfoot90%
$0.22↓#25134↓0.20↓20.1 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Goblin War Wagon89%
$0.05↓#30411↓0.40↓22.9 years↓
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Goblin Dirigible88%
$0.10↓#31190↓0.00↓22.9 years↓
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
+1 more matching line
Colossus of Sardia88%
$0.24↓#23107↓0.27↓32.5 years
"This creature doesn't untap during your untap step."
+1 more matching line
Dwarven Patrol88%
$0.14↓#29563↓0.00↓25.3 years↓
"This creature doesn't untap during your untap step."
Depth Charge Colossus87%
$0.16↓#21612↓0.00↓3.8 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Elaborate Firecannon86%
$0.06↓#28847↓0.00↓8.9 years↓
"This artifact doesn't untap during your untap step."
+1 more matching line
Dormant Gomazoa86%
$0.26↓#27887↓0.12↓16.4 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Lurking Roper86%
$0.07↓#24864↓0.47↓5.1 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Black Carriage84%
$0.86↓#29724↓0.53↓30.9 years↓
"This creature doesn't untap during your untap step."
Nettle Sentinel84%
$0.23↓#18658↓0.06↓18.1 years↓
"This creature doesn't untap during your untap step."