Winter Moon 
Artifact
$0.53 #2832 2.08 2.2 years
Players can't untap more than one nonbasic land during their untap steps.
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Cards similar to Winter Moon 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.
Back to Basics92%
$3.56↑#5287↓2.23↑27.9 years↑
"Nonbasic lands don't untap during their controllers' untap steps."
Smoke86%
$7.48↑#6504↓1.58↓33.1 years↑
"Players can't untap more than one creature during their untap steps."
Tsabo's Web84%
$3.28↑#19646↓1.50↓25.9 years↑
"Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step."
Rising Waters83%
$2.09↑#17466↓2.1126.6 years↑
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker83%
$1.84↑#13854↓2.27↑21.6 years↑
"Lands don't untap during their controllers' untap steps."
Imi Statue79%
$0.36↓#24873↓1.13↓21.9 years↑
"Players can't untap more than one artifact during their untap steps."
Damping Field79%
$7.22↑#27156↓1.09↓32.5 years↑
"Players can't untap more than one artifact during their untap steps."
Ruination78%
$0.55↑#8278↓1.9928.5 years↑
"Destroy all nonbasic lands."
Stasis78%
$9.80↑#7794↓3.06↑33.1 years↑
"Players skip their untap steps."
Skyshroud Elite76%
$0.15↓#27257↓0.06↓28.2 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Stoic Angel75%
$0.64↑#15116↓1.09↓17.9 years↑
"Players can't untap more than one creature during their untap steps."
Winter Orb75%
$11.86↑#33692.96↑33.1 years↑
"As long as this artifact is untapped, players can't untap more than one land during their untap steps."
Choke74%
$0.92↑#17272↓1.66↓28.9 years↑
"Islands don't untap during their controllers' untap steps."
Mist of Stagnation74%
$0.49↓#25253↓1.41↓24.3 years↑
"Permanents don't untap during their controllers' untap steps."
Dream Tides73%
$0.46↓#18058↓1.46↓29.6 years↑
"Creatures don't untap during their controllers' untap steps."
Magus of the Moon73%
$3.97↑#32851.75↓19.3 years↑
"Nonbasic lands are Mountains."
Blood Moon73%
$7.32↑#1485↑2.1332.1 years↑
"Nonbasic lands are Mountains."
Harbinger of the Seas72%
$1.56↑#3774↓1.41↓2.2 years
"Nonbasic lands are Islands."
Destructive Flow72%
$1.42↑#20003↓1.39↓25.6 years↑
"At the beginning of each player's upkeep, that player sacrifices a nonbasic land of their choice."
Price of Progress72%
$4.26↑#28100.70↓28.2 years↑
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."