Limited Resources 
Enchantment
When this enchantment enters, each player chooses five lands they control and sacrifices the rest.
Players can't play lands as long as ten or more lands are on the battlefield.
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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.
Tomik, Distinguished Advokist 82%
$0.38#10837
"Lands on the battlefield and land cards in graveyards can't be the targets of spells or abilities your opponents control."