Mist of Stagnation 
Enchantment
$0.49 #25253 1.41 24.3 years
Permanents don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player chooses a permanent for each card in their graveyard, then untaps those permanents.
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Cards similar to Mist of Stagnation 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.
Freyalise's Radiance79%
$0.23↓#31519↓0.12↓20.1 years↓
"Snow permanents don't untap during their controllers' untap steps."
Rising Waters76%
$2.09↑#17466↑2.11↑26.6 years↑
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Hokori, Dust Drinker76%
$1.84↑#13854↑2.27↑21.6 years↓
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Psychic Overload74%
$0.16↓#30419↓0.67↓22.6 years↓
"Enchanted permanent doesn't untap during its controller's untap step."
Smoke74%
$7.48↑#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
Dream Tides74%
$0.46↓#18058↑1.4629.6 years↑
"Creatures don't untap during their controllers' untap steps."
+1 more matching line
Winter Moon74%
$0.53↑#2832↑2.08↑2.2 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Seedborn Muse73%
$14.66↑#285↑1.77↑23.6 years
"Untap all permanents you control during each other player's untap step."
Intruder Alarm72%
$3.53↑#1727↑1.3928.5 years↑
"Creatures don't untap during their controllers' untap steps."