Tsabo's Web 
Artifact
$2.94 #19881 1.01 26.0 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%
$2.07↓#177572.31↑26.7 years
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker86%
$1.97↓#14011↑2.32↑21.7 years↓
"Lands don't untap during their controllers' untap steps."
Back to Basics84%
$2.99↑#5476↑2.16↑28.0 years↑
"Nonbasic lands don't untap during their controllers' untap steps."
Winter Moon84%
$0.60↓#2951↑2.32↑2.3 years↓
"Players can't untap more than one nonbasic land during their untap steps."
Choke80%
$0.86↓#175771.76↑29.0 years↑
"Islands don't untap during their controllers' untap steps."
Curse of Marit Lage78%
$2.66↓#25838↓1.32↑31.4 years↑
"Islands don't untap during their controllers' untap steps."
Joraga Visionary77%
$0.17↓#210050.00↓6.1 years↓
"When this creature enters, draw a card."
Pond Prophet77%
$0.24↓#6293↑0.04↓2.2 years↓
"When this creature enters, draw a card."
Roving Harper77%
$0.25↓#163450.00↓4.4 years↓
"When this creature enters, draw a card."
Rhox Oracle77%
$0.08↓#27287↓0.00↓8.3 years↓
"When this creature enters, draw a card."
Kindly Customer77%
$0.27↓#10959↑0.07↓0.9 years↓
"When this creature enters, draw a card."
Council of Advisors77%
$7.32↑#26916↓0.00↓27.5 years↑
"When this creature enters, draw a card."
Striped Bears77%
$0.27↓#11813↑0.25↓29.4 years↑
"When this creature enters, draw a card."
Gallant Citizen77%
$0.06↓#163960.07↓1.1 years↓
"When this creature enters, draw a card."
Merchant of Secrets77%
$0.08↓#173830.06↓23.7 years↓
"When this creature enters, draw a card."
Shaman of Spring77%
$0.13↓#227970.27↓12.3 years↓
"When this creature enters, draw a card."
Spirited Companion77%
$0.23↓#944↑0.07↓4.7 years↓
"When this creature enters, draw a card."
Kavu Climber77%
$0.03↓#27450↓0.00↓26.0 years
"When this creature enters, draw a card."
Generous Stray77%
$0.19↓#13614↑0.00↓8.0 years↓
"When this creature enters, draw a card."
Nimble Innovator77%
$0.02↓#27910↓0.00↓10.1 years↓
"When this creature enters, draw a card."