Mage Hunter 
Creature — Horror
$0.14 #17506 0.33 5.4 years
Whenever an opponent casts or copies an instant or sorcery spell, they lose 1 life.
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Cards similar to Mage Hunter 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.
Arasta of the Endless Web83%
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"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
Ichneumon Druid78%
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"Whenever an opponent casts an instant spell other than the first instant spell that player casts each turn, this creature deals 4 damage to that player."
Mindsparker74%
$0.08↓#201110.3613.1 years↑
"Whenever an opponent casts a white or blue instant or sorcery spell, this creature deals 2 damage to that player."
Wandering Archaic // Explore the Vastlands74%
$8.92↑#1272↑0.85↑5.4 years
"Whenever an opponent casts an instant or sorcery spell, they may pay 
. If they don't, you may copy that spell. You may choose new targets for the copy."
. If they don't, you may copy that spell. You may choose new targets for the copy."
Brush Off74%
$0.25↑#12999↑0.00↓0.4 years↓
"This spell costs 
less to cast if it targets an instant or sorcery spell."
less to cast if it targets an instant or sorcery spell."
Mirrorwing Dragon72%
$0.30↑#8196↑0.14↓10.1 years↑
"Whenever a player casts an instant or sorcery spell that targets only this creature, that player copies that spell for each other creature they control that the spell could target. Each copy targets a different one of those creatures."
Curse of Echoes71%
$0.55↑#10041↑0.83↑14.6 years↑
"Whenever enchanted player casts an instant or sorcery spell, each other player may copy that spell and may choose new targets for the copy they control."
Dovin, Hand of Control70%
$0.31↑#8497↑0.82↑7.3 years↑
"Artifact, instant, and sorcery spells your opponents cast cost more to cast."
more to cast."