Electrostatic Field 
Creature — Wall
$1.01 #1632 0.31 8.0 years
Defender
Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent.
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Cards similar to Electrostatic Field 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.
Erebor Flamesmith100%
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"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent."
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"Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent."
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"Whenever you cast an instant or sorcery spell, this enchantment deals 2 damage to each opponent."
Exalted Flamer of Tzeentch91%
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"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent."
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"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent. If five or more mana was spent to cast that spell, this creature deals 3 damage to each opponent instead."
Weaver of Lightning86%
$0.10↓#20897↓0.06↓10.2 years↑
"Whenever you cast an instant or sorcery spell, this creature deals 1 damage to target creature an opponent controls."
Firebrand Archer84%
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"Whenever you cast a noncreature spell, this creature deals 1 damage to each opponent."
Kessig Flamebreather84%
$3.34↑#15040.224.9 years↓
"Whenever you cast a noncreature spell, this creature deals 1 damage to each opponent."
Unruly Catapult82%
$0.30↓#4466↓0.13↓3.1 years↓
"Whenever you cast an instant or sorcery spell, untap this creature."
+1 more matching line
Thermo-Alchemist82%
$0.17↓#17580.16↓10.2 years↑
"Whenever you cast an instant or sorcery spell, untap this creature."
+1 more matching line
Devoted Duelist82%
$0.10↓#12054↓0.10↓1.5 years↓
"Whenever you cast your second spell each turn, this creature deals 1 damage to each opponent."
Stinging Barrier81%
$0.13↓#27270↓0.00↓27.0 years↑
"Defender"
Enraged Flamecaster80%
$0.14↓#14469↓0.12↓0.7 years↓
"Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent."
Wall of Razors79%
$0.31↓#21851↓0.18↓28.6 years↑
"Defender"
Wall of Ice79%
$0.31↓#17299↓0.06↓33.2 years↑
"Defender"
Razorgrass Screen79%
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"Defender"
Moat Piranhas79%
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Murmuring Phantasm79%
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"Defender"
Wall of Granite79%
$0.35↓#27002↓0.06↓29.5 years↑
"Defender"