Aura Flux 

Enchantment
$0.24 #24741 1.12 27.7 years
Other enchantments have "At the beginning of your upkeep, sacrifice this enchantment unless you pay
."
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Cards similar to Aura Flux 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.
Pendrell Mists90%
$12.80↑#17410↑1.61↑29.4 years↑
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Magus of the Tabernacle90%
$2.14↑#17460↑1.52↑19.7 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Pendrell Flux83%
$0.12↓#272480.47↓28.0 years
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
Vile Consumption82%
$10.46↑#13643↑1.1426.0 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay 1 life.""
Energy Flux80%
$0.27↑#15121↑1.53↑32.6 years↑
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
.""
Kataki, War's Wage79%
$0.64↑#9834↑1.39↑21.4 years↓
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
.""
Slow Motion78%
$0.19↓#240000.22↓27.7 years
"At the beginning of the upkeep of enchanted creature's controller, that player sacrifices that creature unless they pay
."
Instill Furor77%
$0.09↓#30099↓0.33↓21.0 years↓
"Enchanted creature has "At the beginning of your end step, sacrifice this creature unless it attacked this turn.""
Inevitable End76%
$0.20↓#19693↑0.55↓6.7 years↓
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
Disruption Aura76%
$0.15↓#30519↓0.25↓22.4 years↓
"Enchanted artifact has "At the beginning of your upkeep, sacrifice this artifact unless you pay its mana cost.""
The Tabernacle at Pendrell Vale76%
$3239.00↑#8859↑2.83↑32.4 years↑
"All creatures have "At the beginning of your upkeep, destroy this creature unless you pay
.""
Enchanter's Bane74%
$0.29↑#10145↑0.33↓8.2 years↓
"At the beginning of your end step, target enchantment deals damage equal to its mana value to its controller unless that player sacrifices it."
Soul Tithe72%
$0.18↓#18653↑0.64↓14.0 years↓
"At the beginning of the upkeep of enchanted permanent's controller, that player sacrifices it unless they pay
, where X is its mana value."
Aether Barrier71%
$6.20↑#14547↑1.24↑26.7 years
"Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay
."
Power Taint70%
$0.21↓#265790.22↓28.0 years
"At the beginning of the upkeep of enchanted enchantment's controller, that player loses 2 life unless they pay
."