Intruder Alarm {2}{U}
Enchantment
Creatures don't untap during their controllers' untap steps.
Whenever a creature enters, untap all creatures.
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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.
An-Zerrin Ruins 93%
#21384
"Creatures of the chosen type don't untap during their controllers' untap steps."
Arena of the Ancients 90%
#18622
"Legendary creatures don't untap during their controllers' untap steps."
Dazzling Theater // Prop Room 89%
$0.78#1835
"Untap each creature you control during each other player's untap step."
Walking Dream 89%
$0.19#31324
"This creature doesn't untap during your untap step if an opponent controls two or more creatures."
Thelon's Curse 89%
$0.69#31147
"Blue creatures don't untap during their controllers' untap steps."
+1 more matching line
Magnetic Mountain 89%
$0.41#22770
"Blue creatures don't untap during their controllers' untap steps."
Phyrexian Gremlins 88%
$1.03#29985
"You may choose not to untap this creature during your untap step."
Everglove Courier 88%
$0.09#29550
"You may choose not to untap this creature during your untap step."
Frightshroud Courier 88%
$0.15#29794
"You may choose not to untap this creature during your untap step."