Coral Net {U}
Enchantment — Aura
Enchant green or white creature
Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you discard a card."
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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.
Pendrell Flux 93%
$0.13#26602
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you pay its mana cost.""
+1 more matching line
Necrotic Plague 92%
$0.36#17664
"Enchanted creature has "At the beginning of your upkeep, sacrifice this creature.""
Inevitable End 86%
$0.16#19007
"Enchanted creature has "At the beginning of your upkeep, sacrifice a creature.""
Endless Wurm 84%
$1.99#26828
"At the beginning of your upkeep, sacrifice this creature unless you sacrifice an enchantment."