Mist of Stagnation 
Enchantment
$0.51 #25648 1.55 24.4 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 Radiance78%
$0.23↓#31850↓0.29↓20.2 years↓
"Snow permanents don't untap during their controllers' untap steps."
Rising Waters76%
$2.07↑#17757↑2.31↑26.7 years↑
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Hokori, Dust Drinker76%
$1.97↑#14011↑2.32↑21.7 years↓
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Smoke74%
$7.41↑#6581↑1.72↑33.2 years↑
"Players can't untap more than one creature during their untap steps."
Dream Tides74%
$0.41↓#18339↑1.5429.7 years↑
"Creatures don't untap during their controllers' untap steps."
+1 more matching line
Psychic Overload74%
$0.10↓#307560.20↓22.7 years↓
"Enchanted permanent doesn't untap during its controller's untap step."
Winter Moon74%
$0.60↑#2951↑2.32↑2.3 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Intruder Alarm72%
$3.71↑#1735↑1.5128.6 years↑
"Creatures don't untap during their controllers' untap steps."
Seedborn Muse72%
$16.09↑#286↑1.80↑23.7 years
"Untap all permanents you control during each other player's untap step."