Arena of the Ancients {3}
Artifact
Legendary creatures don't untap during their controllers' untap steps.
When this artifact enters, tap all legendary 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 87%
#21384
"Creatures of the chosen type don't untap during their controllers' untap steps."
Stunning Strike 85%
$0.10#23371
"As long as enchanted creature isn't legendary, it doesn't untap during its controller's untap step."
+1 more matching line
Rona, Herald of Invasion // Rona, Tolarian Obliterator 84%
$1.96#3441
"Whenever you cast a legendary spell, untap this card."
Dazzling Theater // Prop Room 84%
$0.78#1835
"Untap each creature you control during each other player's untap step."
Magnetic Mountain 83%
$0.41#22770
"Blue creatures don't untap during their controllers' untap steps."
Marble Titan 83%
$1.63#17564
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Meekstone 83%
$12.32#2813
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Icy Blast 82%
$1.32#7055
"If you control a creature with power 4 or greater, those creatures don't untap during their controllers' next untap steps."
Walking Dream 82%
$0.19#31324
"This creature doesn't untap during your untap step if an opponent controls two or more creatures."
Raphael, Tag Team Tough 82%
$6.19#11735
"Whenever this card deals combat damage to a player for the first time each turn, untap all attacking creatures. After this combat phase, there is an additional combat phase."
Tangle Kelp 82%
$0.78#30895
"Enchanted creature doesn't untap during its controller's untap step if it attacked during its controller's last turn."
+1 more matching line
Ray of Frost 82%
$0.14#23135
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line
Runner's Bane 82%
$0.05#28830
"Enchanted creature doesn't untap during its controller's untap step."
+1 more matching line