Delusions of Mediocrity 

Enchantment
When this enchantment enters, you gain 10 life.
When this enchantment leaves the battlefield, you lose 10 life.
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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.
Illusions of Grandeur 98%
#10291
"When this enchantment leaves the battlefield, you lose 20 life."
+1 more matching line
Greed's Gambit 90%
$0.35#14079
"When this enchantment leaves the battlefield, you discard three cards, lose 6 life, and sacrifice three creatures."
+1 more matching line
Phyrexian Etchings 88%
$0.28#22487
"When this enchantment is put into a graveyard from the battlefield, you lose 2 life for each age counter on it."