Root Cage 
Enchantment
$0.16 #31662 0.00 26.3 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 Tides78%
$0.46↑#18058↑1.46↑29.6 years↑
"Creatures don't untap during their controllers' untap steps."
Mudslide76%
$7.57↑#19645↑0.93↑31.3 years↑
"Creatures without flying don't untap during their controllers' untap steps."
An-Zerrin Ruins76%
$3.04↑#21706↑1.08↑30.9 years↑
"Creatures of the chosen type don't untap during their controllers' untap steps."
Intruder Alarm75%
$3.53↑#1727↑1.39↑28.5 years↑
"Creatures don't untap during their controllers' untap steps."
Arena of the Ancients74%
$3.54↑#18794↑1.14↑32.3 years↑
"Legendary creatures don't untap during their controllers' untap steps."
Smoke72%
$7.48↑#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
Blizzard71%
$0.85↑#283460.88↑31.3 years↑
"Creatures with flying don't untap during their controllers' untap steps."
Thelon's Curse70%
$0.69↑#315490.93↑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."
Wrath of Marit Lage70%
$0.33↑#24173↑0.75↑31.3 years↑
"Red creatures don't untap during their controllers' untap steps."