Aether Sting 
Enchantment
$0.43 #15402 0.00 27.4 years
Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player.
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Cards similar to Aether Sting 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.
Mondronen Shaman // Tovolar's Magehunter94%
$0.54↑#144270.12↑14.7 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Spellshock92%
$2.89↑#5624↑0.80↑28.3 years
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."
Soul Barrier90%
$0.27↓#180320.88↑31.4 years↑
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay 
."
."
Pyrostatic Pillar86%
$2.74↑#124630.36↑23.4 years↓
"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."
Ichneumon Druid85%
$3.47↑#28972↓0.0032.4 years↑
"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."
Scab-Clan Berserker85%
$0.27↓#158150.42↑11.3 years↓
"Whenever an opponent casts a noncreature spell, if this creature is renowned, this creature deals 2 damage to that player."
Shadow in the Warp84%
$16.28↑#3603↑0.45↑4.0 years↓
"Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player."
Straw Golem82%
$0.15↓#30399↓0.0029.4 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Cindervines82%
$0.31↓#6535↑0.21↑7.7 years↓
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."
Lasting Tarfire81%
$0.24↓#6199↑0.14↑0.7 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Scalding Viper // Steam Clean80%
$0.35↓#6791↑0.50↑3.1 years↓
"Whenever an opponent casts a spell with mana value 3 or less, this creature deals 1 damage to that player."
Panicked Altisaur80%
$0.16↓#140770.33↑2.9 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Mogg Sentry79%
$0.32↓#22626↓0.12↑25.7 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Dingus Staff76%
$0.33↓#11654↑0.35↑29.4 years↑
"Whenever a creature dies, this artifact deals 2 damage to that creature's controller."
Manabarbs76%
$4.42↑#2300↑1.34↑33.2 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Eidolon of the Great Revel76%
$2.22↑#8389↑0.56↑12.5 years↓
"Whenever a player casts a spell with mana value 3 or less, this creature deals 2 damage to that player."
Hearthborn Battler75%
$0.27↓#7170↑0.12↑2.2 years↓
"Whenever a player casts their second spell each turn, this creature deals 2 damage to target opponent."
Underworld Dreams75%
$1.77↑#1489↑0.72↑32.4 years↑
"Whenever an opponent draws a card, this enchantment deals 1 damage to that player."
Zhur-Taa Druid75%
$0.19↓#4257↑0.15↑13.5 years↓
"Whenever you tap this creature for mana, it deals 1 damage to each opponent."
Dragonlair Spider74%
$0.49↑#8367↑0.31↑14.4 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."