Aether Sting {3}{R}
Enchantment
Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player.
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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.
Soul Barrier 91%
$0.24#17486
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay {2}."
Cindervines 87%
$0.35#6153
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."