Mana Leech 

Creature — Leech
$0.26 #30404 0.25 28.0 years
You may choose not to untap this creature during your untap step.
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Cards similar to Mana Leech 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.
Mole Worms100%
$0.18↓#303980.89↑31.4 years↑
"
: Tap target land. It doesn't untap during its controller's untap step for as long as this creature remains tapped."
+1 more matching line
Amber Prison85%
$0.31↑#23473↑0.2530.0 years↑
"
,
: Tap target artifact, creature, or land. That permanent doesn't untap during its controller's untap step for as long as this artifact remains tapped."
+1 more matching line
Gulf Squid77%
$0.14↓#275810.50↑26.4 years↓
"When this creature enters, tap all lands target player controls."
Floodbringer74%
$0.15↓#19013↑0.2221.7 years↓
"
, Return a land you control to its owner's hand: Tap target land."
Curse of Marit Lage72%
$2.66↑#258381.32↑31.4 years↑
"Islands don't untap during their controllers' untap steps."
Rising Waters71%
$2.07↑#17757↑2.31↑26.7 years↓
"Lands don't untap during their controllers' untap steps."
Hokori, Dust Drinker71%
$1.97↑#14011↑2.32↑21.7 years↓
"Lands don't untap during their controllers' untap steps."
Stensia Innkeeper70%
$0.13↓#293910.2910.2 years↓
"When this creature enters, tap target land an opponent controls. That land doesn't untap during its controller's next untap step."