Sol'kanar the Swamp King {2}{U}{B}{R}
Legendary Creature — Demon
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
Whenever a player casts a black spell, 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.
Paradise Plume 86%
$0.33#10748
"Whenever a player casts a spell of the chosen color, you may gain 1 life."
Throne of Bone 82%
$0.32#24146
"Whenever a player casts a black spell, you may pay {1}. If you do, you gain 1 life."