Marble Titan 
Creature — Giant
$1.63 #17913 1.01 28.9 years
Creatures with power 3 or greater don't untap during their controllers' untap steps.
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Cards similar to Marble Titan 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.
Meekstone100%
$5.12↑#2829↑1.37↑33.1 years↑
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Crackdown92%
$1.05↓#12489↑1.0626.9 years↓
"Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps."
Juntu Stakes88%
$0.31↓#25413↓1.13↑25.9 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Dream Tides77%
$0.46↓#180581.46↑29.6 years
"Creatures don't untap during their controllers' untap steps."
Smoke75%
$7.48↑#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
Mudslide74%
$7.57↑#196450.9331.3 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↑1.39↑28.5 years
"Creatures don't untap during their controllers' untap steps."
Blizzard72%
$0.85↓#28346↓0.88↓31.3 years↑
"Creatures with flying don't untap during their controllers' untap steps."
An-Zerrin Ruins72%
$3.04↑#21706↓1.0830.9 years↑
"Creatures of the chosen type don't untap during their controllers' untap steps."
Solar Tide72%
$0.76↓#198040.62↓22.9 years↓
"• Destroy all creatures with power 3 or greater."
Energy Storm70%
$1.45↓#27434↓0.36↓31.3 years↑
"Creatures with flying don't untap during their controllers' untap steps."
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."
Fell the Mighty70%
$0.26↓#1467↑0.35↓11.8 years↓
"Destroy all creatures with power greater than target creature's power."
Thelon's Curse70%
$0.69↓#31549↓0.9331.8 years↑
"Blue creatures don't untap during their controllers' untap steps."
Magnetic Mountain70%
$0.41↓#23092↓1.0432.7 years↑
"Blue creatures don't untap during their controllers' untap steps."