Yawgmoth's Edict {1}{B}
Enchantment
Whenever an opponent casts a white spell, that player loses 1 life and you gain 1 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.
Kambal, Consul of Allocation 89%
$10.58#1284
"Whenever an opponent casts a noncreature spell, that player loses 2 life and you gain 2 life."
Bontu's Monument 85%
$8.37#664
"Whenever you cast a creature spell, each opponent loses 1 life and you gain 1 life."
Nadier's Nightblade 82%
$0.28#859
"Whenever a token you control leaves the battlefield, each opponent loses 1 life and you gain 1 life."
Knights of the Black Rose 82%
$0.35#11544
"Whenever an opponent becomes the monarch, if you were the monarch as the turn began, that player loses 2 life and you gain 2 life."
Raven Eagle 81%
$0.18#10913
"Whenever you draw your second card each turn, each opponent loses 1 life and you gain 1 life."
Kang, Temporal Tyrant 81%
$0.17#13647
"Whenever you draw your second card each turn, each opponent loses 1 life and you gain 1 life."
Scheming Aspirant 80%
$0.28#6768
"Whenever you proliferate, each opponent loses 2 life and you gain 2 life."