Mana Skimmer 
Creature — Leech
$0.13 #28120 0.68 20.0 years
Flying
Whenever this creature deals damage to a player, tap target land that player controls. That land doesn't untap during its controller's next untap step.
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Cards similar to Mana Skimmer 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.
Stensia Innkeeper88%
$0.13#293910.29↓10.2 years↓
"When this creature enters, tap target land an opponent controls. That land doesn't untap during its controller's next untap step."
Magmatic Hellkite82%
$0.47↑#7205↑0.11↓1.5 years↓
"Flying"
Chandra's Revolution78%
$0.07↓#21845↑0.41↓9.7 years↓
"this card deals 4 damage to target creature. Tap target land. That land doesn't untap during its controller's next untap step."
Mana Vapors77%
$0.33↑#22492↑1.52↑26.4 years↑
"Lands target player controls don't untap during their next untap step."
Somnophore75%
$0.44↑#262080.43↓28.0 years↑
"Whenever this creature deals damage to a player, tap target creature that player controls. That creature doesn't untap during its controller's untap step for as long as this creature remains on the battlefield."
Gulf Squid74%
$0.14↑#275810.50↓26.4 years↑
"When this creature enters, tap all lands target player controls."
Rishadan Dockhand74%
$0.22↑#17696↑0.12↓5.5 years↓
"
, 
: Tap target land."
, : Tap target land."
Thalakos Dreamsower72%
$0.25↑#256580.39↓29.0 years↑
"Whenever this creature deals damage to an opponent, tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped."
Nature's Will71%
$6.38↑#2594↑1.04↑22.1 years↑
"Whenever one or more creatures you control deal combat damage to a player, tap all lands that player controls and untap all lands you control."
Rishadan Port70%
$7.27↑#14696↑0.41↓27.0 years↑
", : Tap target land."
, : Tap target land."
Vorinclex, Voice of Hunger70%
$4.74↑#1766↑2.55↑15.4 years↓
"Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step."