Storage Matrix 
Artifact
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 that do something similar 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.
Static Orb 96%
$14.92#5728
"As long as this artifact is untapped, players can't untap more than two permanents during their untap steps."
Winter Orb 95%
$16.05#3301
"As long as this artifact is untapped, players can't untap more than one land during their untap steps."
Ashnod's Battle Gear 88%
$0.20#30335
"You may choose not to untap this artifact during your untap step."
Vedalken Shackles 88%
$7.66#11447
"You may choose not to untap this artifact during your untap step."
Deserter's Quarters 88%
$0.05#29280
"You may choose not to untap this artifact during your untap step."
Helm of Possession 88%
$5.07#14749
"You may choose not to untap this artifact during your untap step."