Back to Basics 
Enchantment
$3.56 #5287 2.23 27.9 years
Nonbasic lands don't untap during their controllers' untap steps.
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Cards similar to Back to Basics 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.
Winter Moon92%
$0.53↓#2832↑2.08↓2.2 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Rising Waters89%
$2.09↓#17466↓2.11↓26.6 years↓
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker89%
$1.84↓#13854↓2.2721.6 years↓
"Lands don't untap during their controllers' 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."
Choke82%
$0.92↓#17272↓1.66↓28.9 years
"Islands don't untap during their controllers' untap steps."
Curse of Marit Lage80%
$2.64↓#25605↓1.06↓31.3 years↑
"Islands don't untap during their controllers' untap steps."
Ruination80%
$0.55↓#8278↓1.99↓28.5 years
"Destroy all nonbasic lands."
Skyshroud Elite74%
$0.15↓#27257↓0.06↓28.2 years
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Magus of the Moon74%
$3.97↑#3285↑1.75↓19.3 years↓
"Nonbasic lands are Mountains."
Blood Moon74%
$7.32↑#1485↑2.13↓32.1 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."
Dryad Sophisticate70%
$0.28↓#18470↓0.24↓20.6 years↓
"Nonbasic landwalk"
Zhao, the Moon Slayer70%
$0.32↓#10209↓0.00↓0.8 years↓
"Nonbasic lands enter tapped."