Aether Sting 
Enchantment
$0.43 #14933 0.12 27.2 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%
$0.51↑#141160.2114.6 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Spellshock92%
$2.98↑#5451↑1.33↑28.2 years
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."
Soul Barrier90%
$0.29↓#177330.55↑31.3 years↑
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay 
."
."
Pyrostatic Pillar86%
$2.77↑#121760.62↑23.3 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↑#28538↓0.31↑32.3 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%
$0.31↓#153970.1711.1 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%
$18.73↑#3477↑0.53↑3.9 years↓
"Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player."
Straw Golem82%
$0.16↓#30011↓0.00↓29.2 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Cindervines82%
$0.33↓#6339↑0.43↑7.6 years↓
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."
Lasting Tarfire81%
$0.25↓#6536↑0.00↓0.6 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%
$0.37↓#6619↑0.213.0 years↓
"Whenever an opponent casts a spell with mana value 3 or less, this creature deals 1 damage to that player."
Panicked Altisaur80%
$0.18↓#136390.072.8 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Mogg Sentry79%
$0.33↓#22304↓0.00↓25.6 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Dingus Staff76%
$0.35↓#11467↑0.39↑29.2 years↑
"Whenever a creature dies, this artifact deals 2 damage to that creature's controller."
Manabarbs76%
$4.32↑#2215↑1.24↑33.1 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Eidolon of the Great Revel76%
$2.16↑#8236↑0.67↑12.3 years↓
"Whenever a player casts a spell with mana value 3 or less, this creature deals 2 damage to that player."
Underworld Dreams76%
$2.01↑#1428↑0.66↑32.3 years↑
"Whenever an opponent draws a card, this enchantment deals 1 damage to that player."
Hearthborn Battler75%
$0.29↓#6817↑0.052.1 years↓
"Whenever a player casts their second spell each turn, this creature deals 2 damage to target opponent."
Fate Unraveler75%
$2.85↑#1705↑0.38↑12.6 years↓
"Whenever an opponent draws a card, this creature deals 1 damage to that player."
Zhur-Taa Druid75%
$0.18↓#4187↑0.24↑13.3 years↓
"Whenever you tap this creature for mana, it deals 1 damage to each opponent."