Grim Monolith 
Artifact
$478.32 #673 1.42 27.6 years
This artifact doesn't untap during your untap step.
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Cards similar to Grim Monolith 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.
Basalt Monolith99%
$3.70↓#5641.19↓33.1 years↑
"This artifact doesn't untap during your untap step."
+2 more matching lines
Mana Vault98%
$87.31↓#146↑1.63↑33.1 years↑
"This artifact doesn't untap during your untap step."
+2 more matching lines
Colossus of Sardia92%
$0.24↓#23107↓0.27↓32.5 years↑
"
: Untap this creature. Activate only during your upkeep."
+1 more matching line
Goblin War Wagon90%
$0.05↓#30411↓0.40↓22.9 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Goblin Dirigible90%
$0.10↓#31190↓0.00↓22.9 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Brass Man89%
$0.20↓#25983↓0.26↓32.7 years↑
"This creature doesn't untap during your untap step."
+1 more matching line
Depth Charge Colossus88%
$0.16↓#21612↓0.00↓3.8 years↓
"
: Untap this creature."
+1 more matching line
Brass Gnat88%
$0.08↓#23166↓0.27↓19.9 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Elaborate Firecannon87%
$0.06↓#28847↓0.00↓8.9 years↓
"This artifact doesn't untap during your untap step."
+1 more matching line
Dwarven Patrol87%
$0.14↓#29563↓0.00↓25.3 years↓
"This creature doesn't untap during your untap step."
Chained Brute86%
$0.26↓#21400↓0.19↓6.1 years↓
"This creature doesn't untap during your untap step."
+1 more matching line
Famished Paladin86%
$0.32↓#15586↓0.29↓8.6 years↓
"This creature doesn't untap during your untap step."
Deep-Slumber Titan86%
$0.24↓#26036↓0.27↓18.3 years↓
"This creature doesn't untap during your untap step."