Vigil for the Lost {3}{W}
Enchantment
Whenever a creature you control dies, you may pay {X}. If you do, you gain X 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.
Bounty Board 83%
$2.06#5072
"Whenever a creature with a bounty counter on it dies, each of its controller's opponents draws a card and gains 2 life."
The Meathook Massacre 83%
$27.65#505
"Whenever a creature an opponent controls dies, you gain 1 life."
Sultai Flayer 82%
$0.10#23529
"Whenever a creature you control with toughness 4 or greater dies, you gain 4 life."
Kamber, the Plunderer 82%
$0.39#8081
"Whenever a creature an opponent controls dies, you gain 1 life and create a Blood token."