An-Zerrin Ruins 
Enchantment
$3.14 #21991 1.15 31.1 years
As this enchantment enters, choose a creature type.
Creatures of the chosen type don't untap during their controllers' untap steps.
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Cards similar to An-Zerrin Ruins 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 Tides82%
$0.41↓#183391.54↑29.7 years↓
"Creatures don't untap during their controllers' untap steps."
Extinction80%
$0.89↓#212120.72↓29.0 years↓
"Destroy all creatures of the creature type of your choice."
Mudslide79%
$6.71↑#198130.90↓31.4 years
"Creatures without flying don't untap during their controllers' untap steps."
Intruder Alarm78%
$3.71↑#1735↑1.51↑28.6 years↓
"Creatures don't untap during their controllers' untap steps."
Juntu Stakes78%
$0.29↓#257200.73↓26.0 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Plague Engineer75%
$0.25↓#16057↑0.50↓7.4 years↓
"Creatures of the chosen type your opponents control get -1/-1."
+1 more matching line
Arena of the Ancients74%
$3.02↓#189471.1332.4 years↑
"Legendary creatures don't untap during their controllers' untap steps."
Witch's Vengeance74%
$0.30↓#222360.17↓7.0 years↓
"Creatures of the creature type of your choice get -3/-3 until end of turn."
Smoke74%
$7.41↑#6581↑1.72↑33.2 years↑
"Players can't untap more than one creature during their untap steps."
Blizzard74%
$0.83↓#28621↓0.61↓31.4 years
"Creatures with flying don't untap during their controllers' untap steps."
Engineered Plague73%
$6.18↑#218250.22↓27.7 years↓
"As this enchantment enters, choose a creature type."
Magnetic Mountain73%
$0.41↓#234071.0832.8 years↑
"Blue creatures don't untap during their controllers' untap steps."
Thelon's Curse73%
$0.63↓#31915↓0.84↓32.0 years
"Blue creatures don't untap during their controllers' untap steps."
Crackdown73%
$1.00↓#12491↑1.27↑27.0 years↓
"Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps."
Root Cage72%
$0.15↓#31952↓0.12↓26.4 years↓
"Mercenaries don't untap during their controllers' untap steps."
Walking Desecration72%
$0.16↓#27353↓0.12↓24.0 years↓
"
, 
: Creatures of the creature type of your choice attack this turn if able."
, : Creatures of the creature type of your choice attack this turn if able."
Wrath of Marit Lage72%
$0.33↓#245391.35↑31.4 years
"Red creatures don't untap during their controllers' untap steps."
Meekstone72%
$5.87↑#2829↑1.52↑33.2 years↑
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Marble Titan72%
$2.05↓#182341.1329.0 years↓
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Energy Storm72%
$1.41↓#27699↓1.1231.4 years
"Creatures with flying don't untap during their controllers' untap steps."