Energy Flux 

Enchantment
$0.19 #14903 1.14 32.5 years
All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
."
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Cards similar to Energy 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.
Kataki, War's Wage97%
$0.85↑#9602↑1.0621.3 years↓
"All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay
.""
Pendrell Mists90%
$12.76↑#172121.2329.2 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Magus of the Tabernacle88%
$2.00↑#172031.26↑19.6 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay
.""
Disruption Aura88%
$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.""
Aether Barrier82%
$5.69↑#144221.0726.6 years↓
"Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay
."
The Tabernacle at Pendrell Vale80%
$3069.50↑#8892↑2.68↑32.3 years
"All creatures have "At the beginning of your upkeep, destroy this creature unless you pay
.""
Vile Consumption80%
$10.23↑#135690.93↓25.9 years↓
"All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay 1 life.""
Fade Away80%
$0.28↑#133120.99↓28.2 years↓
"For each creature, its controller sacrifices a permanent of their choice unless they pay
."
Aura Flux80%
$0.23↑#24523↓1.1427.6 years↓
"Other enchantments have "At the beginning of your upkeep, sacrifice this enchantment unless you pay
.""
Rishadan Footpad74%
$0.35↑#19597↓0.44↓26.9 years↓
"When this creature enters, each opponent sacrifices a permanent of their choice unless they pay
."
Rishadan Cutpurse74%
$0.14↓#18964↓0.69↓26.9 years↓
"When this creature enters, each opponent sacrifices a permanent of their choice unless they pay
."
Spelltithe Enforcer74%
$7.15↑#8604↑1.1620.6 years↓
"Whenever an opponent casts a spell, that player sacrifices a permanent of their choice unless they pay
."
Pendrell Flux73%
$0.13↓#26887↓0.36↓27.9 years↓
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
Soul Tithe73%
$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."
Slow Motion72%
$0.19#23702↓0.44↓27.6 years↓
"At the beginning of the upkeep of enchanted creature's controller, that player sacrifices that creature unless they pay
."
Rishadan Brigand70%
$0.46↑#21599↓0.19↓26.9 years↓
"When this creature enters, each opponent sacrifices a permanent of their choice unless they pay
."