Glaciers 


Enchantment
At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{U}.
All Mountains are Plains.
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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.
Mangara's Equity 93%
$0.19#30364
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {1}{W}."
Drought 92%
$0.32#27513
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Justice 92%
$0.19#27313
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {W}{W}."
Chromium 86%
#23813
"At the beginning of your upkeep, sacrifice this card unless you pay {W}{U}{B}."