Exhaustion 
Sorcery
$0.24 #17710 1.53 29.5 years
Creatures and lands target opponent controls don't untap during their next untap step.
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Cards similar to Exhaustion 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.
Mana Vapors90%
$0.33↑#22492↓1.5226.4 years↓
"Lands target player controls don't untap during their next untap step."
Reduce // Rubble77%
$0.20↓#24350↓0.62↓9.5 years↓
"Up to three target lands don't untap during their controller's next untap step."
Misstep76%
$0.20↓#26910↓0.96↓27.0 years↓
"Creatures target player controls don't untap during that player's next untap step."
Stensia Innkeeper74%
$0.13↓#29391↓0.29↓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."
Chandra's Revolution72%
$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."
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."