Aura Flux 

Enchantment
$0.23 #24523 1.14 27.6 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%
$12.76↑#17212↑1.2329.2 years↑
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Magus of the Tabernacle90%
$2.00↑#17203↑1.26↑19.6 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Pendrell Flux82%
$0.13↓#268870.36↓27.9 years
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
Vile Consumption81%
$10.23↑#13569↑0.93↓25.9 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay 1 life.""
Energy Flux80%
$0.19↓#14903↑1.1432.5 years↑
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
.""
Slow Motion80%
$0.19↓#237020.44↓27.6 years
"At the beginning of the upkeep of enchanted creature's controller, that player sacrifices that creature unless they pay
."
Kataki, War's Wage78%
$0.85↑#9602↑1.0621.3 years↓
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
.""
Instill Furor76%
$0.04↓#29755↓0.07↓20.9 years↓
"Enchanted creature has "At the beginning of your end step, sacrifice this creature unless it attacked this turn.""
Disruption Aura76%
$0.11↓#30208↓0.32↓22.3 years↓
"Enchanted artifact has "At the beginning of your upkeep, sacrifice this artifact unless you pay its mana cost.""
Inevitable End76%
$0.17↓#19406↑0.62↓6.6 years↓
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
The Tabernacle at Pendrell Vale75%
$3069.50↑#8892↑2.68↑32.3 years↑
"All creatures have "At the beginning of your upkeep, destroy this creature unless you pay
.""
Enchanter's Bane73%
$0.62↑#9656↑0.42↓8.1 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%
$0.17↓#18409↑0.25↓13.9 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 Barrier70%
$5.69↑#14422↑1.0726.6 years
"Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay
."