Back to Basics 
Enchantment
$2.99 #5476 2.16 28.0 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%
$0.60↓#2951↑2.32↑2.3 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Rising Waters89%
$2.07↓#17757↓2.31↑26.7 years↓
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker89%
$1.97↓#14011↓2.32↑21.7 years↓
"Lands don't untap during their controllers' 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."
Choke81%
$0.86↓#17577↓1.76↓29.0 years
"Islands don't untap during their controllers' untap steps."
Curse of Marit Lage80%
$2.66↓#25838↓1.32↓31.4 years↑
"Islands don't untap during their controllers' untap steps."
Ruination80%
$0.63↓#8454↓2.1128.6 years
"Destroy all nonbasic lands."
Skyshroud Elite74%
$0.14↓#27655↓0.00↓28.3 years
"This creature gets +1/+2 as long as an opponent controls a nonbasic land."
Blood Moon74%
$6.66↑#1553↑2.2432.2 years↑
"Nonbasic lands are Mountains."
Magus of the Moon74%
$3.50↑#3430↑1.93↓19.5 years↓
"Nonbasic lands are Mountains."
Harbinger of the Seas72%
$1.60↓#3933↑1.66↓2.3 years↓
"Nonbasic lands are Islands."
Destructive Flow72%
$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."
Dryad Sophisticate70%
$0.24↓#18643↓0.07↓20.7 years↓
"Nonbasic landwalk"
Zhao, the Moon Slayer70%
$0.28↓#10040↓1.10↓0.9 years↓
"Nonbasic lands enter tapped."