Root Cage 
Enchantment
$0.15 #31952 0.12 26.4 years
Mercenaries don't untap during their controllers' untap steps.
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Cards similar to Root Cage 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.
Dream Tides75%
$0.41↑#18339↑1.54↑29.7 years↑
"Creatures don't untap during their controllers' untap steps."
Intruder Alarm73%
$3.71↑#1735↑1.51↑28.6 years↑
"Creatures don't untap during their controllers' untap steps."
Mudslide72%
$6.71↑#19813↑0.90↑31.4 years↑
"Creatures without flying 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."
Arena of the Ancients71%
$3.02↑#18947↑1.13↑32.4 years↑
"Legendary creatures don't untap during their controllers' untap steps."
Smoke70%
$7.41↑#6581↑1.72↑33.2 years↑
"Players can't untap more than one creature during their untap steps."