Meekstone 
Artifact
$5.87 #2829 1.52 33.2 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%
$2.05↓#18234↓1.13↓29.0 years↓
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Crackdown93%
$1.00↓#12491↓1.27↓27.0 years↓
"Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps."
Juntu Stakes89%
$0.29↓#25720↓0.73↓26.0 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Dream Tides78%
$0.41↓#18339↓1.5429.7 years↓
"Creatures don't untap during their controllers' untap steps."
Smoke76%
$7.41↑#6581↓1.72↑33.2 years
"Players can't untap more than one creature during their untap steps."
Mudslide75%
$6.71↑#19813↓0.90↓31.4 years↓
"Creatures without flying don't untap during their controllers' untap steps."
Intruder Alarm74%
$3.71↓#1735↑1.5128.6 years↓
"Creatures don't untap during their controllers' untap steps."
An-Zerrin Ruins72%
$3.14↓#21991↓1.15↓31.1 years↓
"Creatures of the chosen type don't untap during their controllers' untap steps."
Dusk // Dawn72%
$0.26↓#971↑0.34↓9.5 years↓
"Destroy all creatures with power 3 or greater."
Solar Tide72%
$0.79↓#20173↓0.06↓23.0 years↓
"• Destroy all creatures with power 3 or greater."
Blizzard71%
$0.83↓#28621↓0.61↓31.4 years↓
"Creatures with flying don't untap during their controllers' untap steps."
Fell the Mighty70%
$0.30↓#1499↑0.48↓12.0 years↓
"Destroy all creatures with power greater than target creature's power."
The Battle of Bywater70%
$1.87↓#1863↑0.40↓3.3 years↓
"Destroy all creatures with power 3 or greater. Then create a Food token for each creature you control."
Entrancing Lyre70%
$0.11↓#23486↓0.18↓6.7 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."