Mudslide 

Enchantment
$7.57 #19645 0.93 31.3 years
Creatures without flying don't untap during their controllers' untap steps.
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.
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Cards similar to Mudslide 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.
Thelon's Curse93%
$0.69↓#31549↓0.9331.8 years
"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."
+1 more matching line
Magnetic Mountain92%
$0.41↓#230921.04↑32.7 years↑
"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."
+1 more matching line
Dream Tides92%
$0.46↓#180581.46↑29.6 years↓
"Creatures don't untap during their controllers' untap steps."
+1 more matching line
Intruder Alarm89%
$3.53↓#1727↑1.39↑28.5 years↓
"Creatures don't untap during their controllers' untap steps."
Blizzard87%
$0.85↓#28346↓0.8831.3 years
"Creatures with flying don't untap during their controllers' untap steps."
Energy Storm84%
$1.45↓#27434↓0.36↓31.3 years
"Creatures with flying don't untap during their controllers' untap steps."
Smoke82%
$7.48↓#6504↑1.58↑33.1 years↑
"Players can't untap more than one creature during their untap steps."
An-Zerrin Ruins79%
$3.04↓#217061.08↑30.9 years
"Creatures of the chosen type don't untap during their controllers' untap steps."
Wrath of Marit Lage76%
$0.33↓#24173↓0.75↓31.3 years
"Red creatures don't untap during their controllers' untap steps."
Juntu Stakes76%
$0.31↓#25413↓1.13↑25.9 years↓
"Creatures with power 1 or less don't untap during their controllers' untap steps."
Root Cage76%
$0.16↓#31662↓0.00↓26.3 years↓
"Mercenaries don't untap during their controllers' untap steps."
Arena of the Ancients75%
$3.54↓#187941.14↑32.3 years↑
"Legendary creatures don't untap during their controllers' untap steps."
Singing Bell Strike74%
$0.04↓#229350.17↓11.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Apathy73%
$0.25↓#232760.25↓29.2 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Sands of Time72%
$3.92↓#214021.09↑29.6 years↓
"At the beginning of each player's upkeep, that player simultaneously untaps each tapped artifact, creature, and land they control and taps each untapped artifact, creature, and land they control."
Bonds of Quicksilver72%
$0.05↓#27356↓0.20↓15.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Ringing Strike Mastery72%
$0.13↓#14371↑0.37↓1.4 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Dehydration72%
$0.06↓#28750↓0.25↓26.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."
Paralyzing Grasp72%
$0.05↓#25144↓0.04↓16.9 years↓
"Enchanted creature doesn't untap during its controller's untap step."