The Frightful Four 

Legendary Creature — Villain
Menace
Whenever an opponent casts their first noncreature spell each turn, that player loses life equal to that spell's mana value.
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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.
Gleeful Arsonist 87%
$5.66#2701
"Whenever an opponent casts a noncreature spell, this creature deals damage equal to its power to that player."
Inventive Iteration // Living Breakthrough 83%
$0.30#9276
"Whenever you cast a spell, your opponents can't cast spells with the same mana value as that spell until your next turn."
Magebane Lizard 82%
$0.43#4975
"Whenever a player casts a noncreature spell, this creature deals damage to that player equal to the number of noncreature spells they've cast this turn."
Teferi, Time Raveler 80%
$7.25#1139
"Each opponent can cast spells only any time they could cast a sorcery."
Teferi, Mage of Zhalfir 80%
$3.05#4358
"Each opponent can cast spells only any time they could cast a sorcery."