Arena of the Ancients 
Artifact
$3.02 #18947 1.13 32.4 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.
Dream Tides76%
$0.41↓#183391.54↑29.7 years↓
"Creatures don't untap during their controllers' untap steps."
Mudslide76%
$6.71↑#198130.90↓31.4 years↓
"Creatures without flying don't untap during their controllers' untap steps."
Hero's Demise74%
$1.49↓#194530.13↓21.7 years↓
"Destroy target legendary creature."
An-Zerrin Ruins74%
$3.14↑#219911.1531.1 years↓
"Creatures of the chosen type don't untap during their controllers' untap steps."
Wrath of Marit Lage74%
$0.33↓#24539↓1.35↑31.4 years↓
"When this enchantment enters, tap all red creatures."
+1 more matching line
Stunning Strike73%
$0.17↓#24456↓0.06↓4.4 years↓
"As long as enchanted creature isn't legendary, it doesn't untap during its controller's untap step."
+1 more matching line
Juntu Stakes73%
$0.29↓#25720↓0.73↓26.0 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Intruder Alarm72%
$3.71↑#1735↑1.51↑28.6 years↓
"Creatures don't untap during their controllers' untap steps."
Root Cage71%
$0.15↓#31952↓0.12↓26.4 years↓
"Mercenaries don't untap during their controllers' untap steps."
Paralyze71%
$0.14↓#207020.80↓33.2 years
"When this Aura enters, tap enchanted creature."
+1 more matching line
Containment Protocol71%
$0.22↓#28589↓0.30↓0.6 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Castaway's Despair71%
$0.08↓#26418↓0.21↓9.1 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Waterknot71%
$0.13↓#222110.21↓8.8 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Starlight Snare71%
$0.13↓#205330.93↓1.9 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Charmed Sleep71%
$0.09↓#158580.30↓7.0 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Claustrophobia71%
$0.04↓#192660.32↓15.1 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Capture Sphere71%
$0.05↓#190040.21↓8.0 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Sleep Paralysis71%
$0.08↓#23209↓0.35↓10.5 years↓
"When this Aura enters, tap enchanted creature."
+1 more matching line
Livonya Silone71%
$36.82↑#30230↓0.31↓32.4 years
"First strike; legendary landwalk"
Blizzard70%
$0.83↓#28621↓0.61↓31.4 years↓
"Creatures with flying don't untap during their controllers' untap steps."