Aura Flux {2}{U}
Enchantment
Other enchantments have "At the beginning of your upkeep, sacrifice this enchantment unless you pay {2}."
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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.
Earthlink 90%
#29152
"At the beginning of your upkeep, sacrifice this enchantment unless you pay {2}."
Season of the Witch 89%
$24.21#20160
"At the beginning of your upkeep, sacrifice this enchantment unless you pay 2 life."
Icy Prison 87%
#27891
"At the beginning of your upkeep, sacrifice this enchantment unless any player pays {3}."