Winter Moon 
Artifact
$0.60 #2951 2.32 2.3 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%
$2.99↑#5476↓2.16↓28.0 years↑
"Nonbasic lands don't untap during their controllers' untap steps."
Smoke86%
$7.41↑#6581↓1.72↓33.2 years↑
"Players can't untap more than one creature during their untap steps."
Tsabo's Web84%
$2.94↑#19881↓1.01↓26.0 years↑
"Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step."
Rising Waters83%
$2.07↑#17757↓2.3126.7 years↑
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker83%
$1.97↑#14011↓2.3221.7 years↑
"Lands don't untap during their controllers' untap steps."
Damping Field79%
$7.52↑#27435↓1.22↓32.6 years↑
"Players can't untap more than one artifact during their untap steps."
Imi Statue79%
$0.38↓#25199↓1.17↓22.1 years↑
"Players can't untap more than one artifact during their untap steps."
Ruination78%
$0.63↑#8454↓2.11↓28.6 years↑
"Destroy all nonbasic lands."
Stasis78%
$9.50↑#7869↓3.05↑33.2 years↑
"Players skip their untap steps."
Skyshroud Elite76%
$0.14↓#27655↓0.00↓28.3 years↑
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Stoic Angel75%
$0.66↑#15394↓1.34↓18.0 years↑
"Players can't untap more than one creature during their untap steps."
Winter Orb75%
$11.92↑#34472.93↑33.2 years↑
"As long as this artifact is untapped, players can't untap more than one land during their untap steps."
Mist of Stagnation74%
$0.51↓#25648↓1.55↓24.4 years↑
"Permanents don't untap during their controllers' untap steps."
Dream Tides73%
$0.41↓#18339↓1.54↓29.7 years↑
"Creatures don't untap during their controllers' untap steps."
Blood Moon73%
$6.66↑#1553↑2.2432.2 years↑
"Nonbasic lands are Mountains."
Magus of the Moon73%
$3.50↑#34301.93↓19.5 years↑
"Nonbasic lands are Mountains."
Destructive Flow73%
$1.47↑#20466↓1.69↓25.7 years↑
"At the beginning of each player's upkeep, that player sacrifices a nonbasic land of their choice."
Harbinger of the Seas72%
$1.60↑#3933↓1.66↓2.3 years
"Nonbasic lands are Islands."
Choke72%
$0.86↑#17577↓1.76↓29.0 years↑
"Islands don't untap during their controllers' untap steps."
Price of Progress72%
$4.47↑#28570.41↓28.3 years↑
"this card deals damage to each player equal to twice the number of nonbasic lands that player controls."