Energy Flux 

Enchantment
All artifacts have "At the beginning of your upkeep, sacrifice this artifact 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.
Kataki, War's Wage 99%
$1.65#9468
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay {1}.""
Forethought Amulet 82%
$21.20#31475
"At the beginning of your upkeep, sacrifice this artifact unless you pay {3}."
Disruption Aura 80%
$0.06#29911
"Enchanted artifact has "At the beginning of your upkeep, sacrifice this artifact unless you pay its mana cost.""