Pendrell Flux {1}{U}
Enchantment — Aura
Enchant creature
Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost."
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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.
Necrotic Plague 97%
$0.36#17664
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature.""
+1 more matching line
Coral Net 93%
$0.21#29150
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you discard a card.""
Inevitable End 89%
$0.16#19007
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
+1 more matching line
Endless Wurm 88%
$1.99#26828
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."
Contamination 84%
$17.70#7833
"At the beginning of your upkeep, sacrifice this enchantment unless you sacrifice a creature."
Anurid Scavenger 82%
$0.24#23124
"At the beginning of your upkeep, sacrifice this creature unless you put a card from your graveyard on the bottom of your library."
Razormane Masticore 80%
$0.21#26753
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Molten-Tail Masticore 80%
$0.39#29145
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Masticore 80%
#24663
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Eldrazi Monument 80%
$9.84#1430
"At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice this artifact."