Ice Floe
Land
You may choose not to untap this land during your untap step.
{T}: Tap target creature without flying that's attacking you. It doesn't untap during its controller's untap step for as long as this land remains tapped.
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Cards that do something similar 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.
Tsabo's Web 93%
$32.74#19333
"Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step."
Innocuous Researcher 88%
$0.26#12932
"At the beginning of your end step, you may untap all lands you control. If you do, you can't cast spells until your next turn."
Land Cap 88%
$1.01#28244
"This land doesn't untap during your untap step if it has a depletion counter on it."
Timberline Ridge 88%
$0.98#29691
"This land doesn't untap during your untap step if it has a depletion counter on it."
River Delta 88%
$0.90#27071
"This land doesn't untap during your untap step if it has a depletion counter on it."
Veldt 88%
$1.17#29106
"This land doesn't untap during your untap step if it has a depletion counter on it."
Lava Tubes 88%
$1.11#27972
"This land doesn't untap during your untap step if it has a depletion counter on it."
Winter Moon 86%
$0.41#2720
"Players can't untap more than one nonbasic land during their untap steps."
Wilderness Reclamation 85%
$2.14#926
"At the beginning of your end step, untap all lands you control."