Stoic Angel 
Creature — Angel
$0.64 #15116 1.09 17.9 years
Flying, vigilance
Players can't untap more than one creature during their untap steps.
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Cards similar to Stoic Angel 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.
Smoke91%
$7.48↑#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
Stasis82%
$9.80↑#7794↑3.06↑33.1 years↑
"Players skip their untap steps."
Imi Statue81%
$0.36↓#24873↓1.1321.9 years↑
"Players can't untap more than one artifact during their untap steps."
Damping Field81%
$7.22↑#27156↓1.0932.5 years↑
"Players can't untap more than one artifact during their untap steps."
Dream Tides76%
$0.46↓#180581.46↑29.6 years↑
"Creatures don't untap during their controllers' untap steps."
Static Orb76%
$2.47↑#5743↑2.62↑28.9 years↑
"As long as this artifact is untapped, players can't untap more than two permanents during their untap steps."
Winter Moon75%
$0.53↓#2832↑2.08↑2.2 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Windborn Muse74%
$0.48↓#999↑0.87↓23.6 years↑
"Flying"
Intruder Alarm74%
$3.53↑#1727↑1.39↑28.5 years↑
"Creatures don't untap during their controllers' untap steps."
Mudslide71%
$7.57↑#19645↓0.93↓31.3 years↑
"Creatures without flying don't untap during their controllers' untap steps."
Linvala, Keeper of Silence71%
$18.85↑#2590↑1.47↑16.4 years↓
"Activated abilities of creatures your opponents control can't be activated."
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