Tsabo's Web 
Artifact
$3.28 #19646 1.50 25.9 years
When this artifact enters, draw a card.
Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step.
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Cards similar to Tsabo's Web 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.
Rising Waters86%
$2.09↓#174662.11↑26.6 years
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker86%
$1.84↓#13854↑2.27↑21.6 years↓
"Lands don't untap during their controllers' untap steps."
Back to Basics84%
$3.56↑#5287↑2.23↑27.9 years↑
"Nonbasic lands don't untap during their controllers' untap steps."
Winter Moon84%
$0.53↓#2832↑2.08↑2.2 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Choke81%
$0.92↓#172721.66↑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."
Kavu Climber77%
$0.04↓#27191↓0.19↓25.9 years
"When this creature enters, draw a card."
Elvish Visionary77%
$0.10↓#2293↑0.15↓17.9 years↓
"When this creature enters, draw a card."
Council of Advisors77%
$7.12↑#26727↓0.57↓27.3 years↑
"When this creature enters, draw a card."
Striped Bears77%
$0.30↓#11801↑0.39↓29.2 years↑
"When this creature enters, draw a card."
Spirited Companion77%
$0.20↓#905↑0.12↓4.5 years↓
"When this creature enters, draw a card."
Pond Prophet77%
$0.25↓#6138↑0.04↓2.1 years↓
"When this creature enters, draw a card."
Shaman of Spring77%
$0.15↓#224800.07↓12.1 years↓
"When this creature enters, draw a card."
Gallant Citizen77%
$0.09↓#164440.33↓1.0 years↓
"When this creature enters, draw a card."
Rhox Oracle77%
$0.05↓#26903↓0.13↓8.1 years↓
"When this creature enters, draw a card."
Merchant of Secrets77%
$0.04↓#170700.33↓23.6 years↓
"When this creature enters, draw a card."
Joraga Visionary77%
$0.07↓#207240.00↓5.9 years↓
"When this creature enters, draw a card."
Helpful Hunter77%
$0.34↓#1969↑0.09↓1.8 years↓
"When this creature enters, draw a card."
Roving Harper77%
$0.20↓#158630.00↓4.2 years↓
"When this creature enters, draw a card."
Generous Stray77%
$0.26↓#13395↑0.06↓7.9 years↓
"When this creature enters, draw a card."