Thelon's Curse 
Enchantment
$0.69 #31549 0.93 31.8 years
Blue creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay 
for each creature chosen this way. If the player does, untap those creatures.
for each creature chosen this way. If the player does, untap those creatures.Click a line or tag to filter
Cards similar to Thelon's Curse 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.
Magnetic Mountain100%
$0.41↓#23092↑1.04↑32.7 years
"Blue creatures don't untap during their controllers' untap steps."
+1 more matching line
Mudslide93%
$7.57↑#19645↑0.9331.3 years
"At the beginning of each player's upkeep, that player may choose any number of tapped creatures without flying they control and pay 
for each creature chosen this way. If the player does, untap those creatures."
for each creature chosen this way. If the player does, untap those creatures."+1 more matching line
Dream Tides90%
$0.46↓#18058↑1.46↑29.6 years↓
"At the beginning of each player's upkeep, that player may choose any number of tapped nongreen creatures they control and pay for each creature chosen this way. If the player does, untap those creatures."
for each creature chosen this way. If the player does, untap those creatures."+1 more matching line
Intruder Alarm82%
$3.53↑#1727↑1.39↑28.5 years↓
"Creatures don't untap during their controllers' untap steps."
Wrath of Marit Lage79%
$0.33↓#24173↑0.75↓31.3 years
"Red creatures don't untap during their controllers' untap steps."
An-Zerrin Ruins75%
$3.04↑#21706↑1.08↑30.9 years
"Creatures of the chosen type don't untap during their controllers' untap steps."
Blizzard74%
$0.85↑#283460.8831.3 years
"Creatures with flying don't untap during their controllers' untap steps."
Juntu Stakes74%
$0.31↓#254131.13↑25.9 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Crackdown73%
$1.05↑#12489↑1.06↑26.9 years↓
"Nonwhite creatures with power 3 or greater don't untap during their controllers' untap steps."
Smoke72%
$7.48↑#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
Energy Storm72%
$1.45↑#274340.36↓31.3 years
"Creatures with flying don't untap during their controllers' untap steps."
Mudbrawler Raiders72%
$0.07↓#311280.06↓18.3 years↓
"This creature can't be blocked by blue creatures."
Riptide71%
$0.31↓#288830.43↓32.1 years
"Tap all blue creatures."
Root Cage70%
$0.16↓#316620.00↓26.3 years↓
"Mercenaries don't untap during their controllers' untap steps."
Meekstone70%
$5.12↑#2829↑1.37↑33.1 years↑
"Creatures with power 3 or greater don't untap during their controllers' untap steps."
Arena of the Ancients70%
$3.54↑#18794↑1.14↑32.3 years
"Legendary creatures don't untap during their controllers' untap steps."
Marble Titan70%
$1.63↑#17913↑1.0128.9 years↓
"Creatures with power 3 or greater don't untap during their controllers' untap steps."