Static Orb 
Artifact
$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.
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Cards similar to Static Orb 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 Orb97%
$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."
Howling Mine82%
$5.04↑#716↑0.29↓33.1 years↑
"At the beginning of each player's draw step, if this artifact is untapped, that player draws an additional card."
Stoic Angel76%
$0.64↓#15116↓1.09↓17.9 years↓
"Players can't untap more than one creature during their untap steps."
Imi Statue75%
$0.36↓#24873↓1.13↓21.9 years↓
"Players can't untap more than one artifact during their untap steps."
Damping Field75%
$7.22↑#27156↓1.09↓32.5 years↑
"Players can't untap more than one artifact during their untap steps."
Storage Matrix74%
$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."
Smoke74%
$7.48↑#65041.58↓33.1 years↑
"Players can't untap more than one creature during their untap steps."
Stasis71%
$9.80↑#7794↓3.06↑33.1 years↑
"Players skip their untap steps."
Blinkmoth Urn70%
$1.02↓#58250.47↓22.9 years↓
"At the beginning of each player's first main phase, if this artifact is untapped, that player adds 
for each artifact they control."
for each artifact they control."
Trinisphere70%
$32.76↑#52351.54↓22.6 years↓
"As long as this artifact is untapped, each spell that would cost less than three mana to cast costs three mana to cast."