Forsaken City
Land
This land doesn't untap during your untap step.
At the beginning of your upkeep, you may exile a card from your hand. If you do, untap this land.
{T}: Add one mana of any color.
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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 96%
$32.74#19333
"Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step."
Rising Waters 91%
$2.05#17155
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Hokori, Dust Drinker 91%
$1.62#13615
"Lands don't untap during their controllers' untap steps."
+1 more matching line
Land Cap 90%
$1.01#28244
"This land doesn't untap during your untap step if it has a depletion counter on it."
Timberline Ridge 90%
$0.98#29691
"This land doesn't untap during your untap step if it has a depletion counter on it."
River Delta 90%
$0.90#27071
"This land doesn't untap during your untap step if it has a depletion counter on it."
Veldt 90%
$1.17#29106
"This land doesn't untap during your untap step if it has a depletion counter on it."
Lava Tubes 90%
$1.11#27972
"This land doesn't untap during your untap step if it has a depletion counter on it."
Innocuous Researcher 84%
$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."
Wilderness Reclamation 82%
$2.14#926
"At the beginning of your end step, untap all lands you control."
Winter Moon 81%
$0.41#2720
"Players can't untap more than one nonbasic land during their untap steps."