Storage Matrix 
Artifact
$2.59 #13716 1.40 27.2 years
As long as this artifact is untapped, each player chooses artifact, creature, or land during their untap step. That player can untap only permanents of the chosen type this step.
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Cards similar to Storage Matrix 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 Orb76%
$11.86↑#3369↑2.96↑33.1 years↑
"As long as this artifact is untapped, players can't untap more than one land during their untap steps."
Imi Statue76%
$0.36↓#24873↓1.13↓21.9 years↓
"Players can't untap more than one artifact during their untap steps."
Damping Field76%
$7.22↑#27156↓1.09↓32.5 years↑
"Players can't untap more than one artifact during their untap steps."
Amber Prison74%
$0.30↓#23249↓0.57↓29.9 years↑
"You may choose not to untap this artifact during your untap step."
Static Orb74%
$2.47↓#5743↑2.62↑28.9 years↑
"As long as this artifact is untapped, players can't untap more than two permanents during their untap steps."
Rising Waters70%
$2.09↓#17466↓2.11↑26.6 years
"At the beginning of each player's upkeep, that player untaps a land they control."
Hokori, Dust Drinker70%
$1.84↓#138542.27↑21.6 years↓
"At the beginning of each player's upkeep, that player untaps a land they control."