Mana Vault 
Artifact
$94.65 #153 1.78 33.2 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%
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"This artifact doesn't untap during your untap step."
+2 more matching lines
Basalt Monolith98%
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"This artifact doesn't untap during your untap step."
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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%
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"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
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Phyrexian Ironfoot90%
$0.19↓#25367↓0.00↓20.2 years↓
"This creature doesn't untap during your untap step."
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Goblin War Wagon89%
$0.08↓#30721↓0.00↓23.0 years↓
"At the beginning of your upkeep, you may pay
. If you do, untap this creature."
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Goblin Dirigible88%
$0.15↓#31457↓0.00↓23.0 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↓#23255↓0.00↓32.6 years
"This creature doesn't untap during your untap step."
+1 more matching line
Dwarven Patrol87%
$0.16↓#29888↓0.00↓25.4 years↓
"This creature doesn't untap during your untap step."
Depth Charge Colossus87%
$0.17↓#21908↓0.06↓3.9 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Traxos, Scourge Eternal86%
$0.16↓#22645↓0.12↓0.0 years↓
"this card doesn't untap during your untap step."
+1 more matching line
Lurking Roper86%
$0.07↓#25223↓0.00↓5.2 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Dormant Gomazoa86%
$0.30↓#28053↓0.40↓16.5 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Elaborate Firecannon85%
$0.06↓#29023↓0.06↓9.1 years↓
"This artifact doesn't untap during your untap step."
+1 more matching line
Nettle Sentinel84%
$0.27↓#18809↓0.13↓18.2 years↓
"This creature doesn't untap during your untap step."