Sulfuric Vapors {3}{R}
Enchantment
If a red spell would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead.
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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.
The Flame of Keld 87%
$0.19#20003
"If a red source you control would deal damage to a permanent or player this turn, it deals that much damage plus 2 to that permanent or player instead."
Jaya, Venerated Firemage 86%
$0.21#13286
"If another red source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead."