Dead of Winter {2}{B}
Sorcery
All nonsnow creatures get -X/-X until end of turn, where X is the number of snow permanents you control.
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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.
Cloudkill 82%
$0.22#15689
"All creatures get -X/-X until end of turn, where X is the greatest mana value of a commander you own on the battlefield or in the command zone."
Deluge of Doom 82%
$0.26#10019
"All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard."