Arena of the Ancients 
Artifact
$3.54 #18794 1.14 32.3 years
Legendary creatures don't untap during their controllers' untap steps.
When this artifact enters, tap all legendary creatures.
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Cards similar to Arena of the Ancients 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.
Wrath of Marit Lage77%
$0.33↓#24173↓0.75↓31.3 years↓
"When this enchantment enters, tap all red creatures."
+1 more matching line
Dream Tides76%
$0.46↓#180581.46↑29.6 years↓
"Creatures don't untap during their controllers' untap steps."
Mudslide75%
$7.57↑#196450.93↓31.3 years↓
"Creatures without flying don't untap during their controllers' untap steps."
Hero's Demise74%
$1.41↓#191430.00↓21.6 years↓
"Destroy target legendary creature."
An-Zerrin Ruins74%
$3.04↓#217061.0830.9 years↓
"Creatures of the chosen type don't untap during their controllers' untap steps."
Root Cage74%
$0.16↓#31662↓0.00↓26.3 years↓
"Mercenaries don't untap during their controllers' untap steps."
Stunning Strike73%
$0.12↓#23973↓0.38↓4.2 years↓
"As long as enchanted creature isn't legendary, it doesn't untap during its controller's untap step."
+1 more matching line
Intruder Alarm72%
$3.53↓#1727↑1.39↑28.5 years↓
"Creatures don't untap during their controllers' untap steps."
Juntu Stakes72%
$0.31↓#25413↓1.1325.9 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Castaway's Despair72%
$0.09↓#26583↓0.53↓8.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Containment Protocol71%
$0.21↓#28751↓0.00↓0.5 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Claustrophobia71%
$0.05↓#190770.36↓14.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Waterknot71%
$0.12↓#218840.25↓8.6 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep Paralysis71%
$0.06↓#23005↓0.88↓10.4 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Paralyze71%
$0.13↓#205250.57↓33.1 years
"When this Aura enters, tap enchanted creature."
+1 more matching line
Capture Sphere71%
$0.05↓#187020.25↓7.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Starlight Snare71%
$0.13↓#204130.25↓1.8 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Charmed Sleep71%
$0.07↓#155620.25↓6.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Livonya Silone71%
$36.26↑#29955↓0.25↓32.3 years
"First strike; legendary landwalk"
Blizzard70%
$0.85↓#28346↓0.88↓31.3 years↓
"Creatures with flying don't untap during their controllers' untap steps."