Meekstone 
Artifact
$5.12 #2829 1.37 33.1 years
Creatures with power 3 or greater don't untap during their controllers' untap steps.
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Cards similar to Meekstone 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.
Marble Titan100%
$1.63↓#17913↓1.01↓28.9 years↓
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Crackdown93%
$1.05↓#12489↓1.06↓26.9 years↓
"Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps."
Juntu Stakes89%
$0.31↓#25413↓1.13↓25.9 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Dream Tides78%
$0.46↓#18058↓1.4629.6 years↓
"Creatures don't untap during their controllers' untap steps."
Smoke76%
$7.48↑#6504↓1.58↑33.1 years
"Players can't untap more than one creature during their untap steps."
Mudslide75%
$7.57↑#19645↓0.93↓31.3 years↓
"Creatures without flying don't untap during their controllers' untap steps."
Dusk // Dawn74%
$0.26↓#941↑0.34↓9.4 years↓
"Destroy all creatures with power 3 or greater."
Intruder Alarm74%
$3.53↓#1727↑1.3928.5 years↓
"Creatures don't untap during their controllers' untap steps."
An-Zerrin Ruins72%
$3.04↓#21706↓1.08↓30.9 years↓
"Creatures of the chosen type don't untap during their controllers' untap steps."
Solar Tide72%
$0.76↓#19804↓0.62↓22.9 years↓
"• Destroy all creatures with power 3 or greater."
Blizzard71%
$0.85↓#28346↓0.88↓31.3 years↓
"Creatures with flying don't untap during their controllers' untap steps."
Fell the Mighty70%
$0.26↓#1467↑0.35↓11.8 years↓
"Destroy all creatures with power greater than target creature's power."
The Battle of Bywater70%
$3.78↓#1835↑0.29↓3.2 years↓
"Destroy all creatures with power 3 or greater. Then create a Food token for each creature you control."
Thelon's Curse70%
$0.69↓#31549↓0.93↓31.8 years↓
"Blue creatures don't untap during their controllers' untap steps."
Magnetic Mountain70%
$0.41↓#23092↓1.04↓32.7 years
"Blue creatures don't untap during their controllers' untap steps."
Entrancing Lyre70%
$0.10↓#23187↓0.12↓6.6 years↓
"
, 
: Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."
, : Tap target creature with power X or less. It doesn't untap during its controller's untap step for as long as this artifact remains tapped."