Firestorm 
Instant
$46.26 #11174 0.12 29.4 years
As an additional cost to cast this spell, discard X cards.
Firestorm deals X damage to each of X targets.
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Cards similar to Firestorm 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.
Turbulent Dreams95%
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"As an additional cost to cast this spell, discard X cards."
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"As an additional cost to cast this spell, discard X cards."
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Furious Reprisal94%
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"this card deals 2 damage to each of two targets."
Pinnacle of Rage94%
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"this card deals 3 damage to each of two targets."
Conflagrate92%
$0.27↓#18394↓0.1120.0 years↓
"this card deals X damage divided as you choose among any number of targets."
+1 more matching line
Nahiri's Wrath92%
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"As an additional cost to cast this spell, discard X cards."
+1 more matching line
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"this card deals X damage divided as you choose among any number of targets."
Pyrotechnics92%
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"this card deals 4 damage divided as you choose among any number of targets."
Boulderfall92%
$0.03↓#27714↓0.00↓13.1 years↓
"this card deals 5 damage divided as you choose among any number of targets."
Channeled Force91%
$0.24↓#107100.066.5 years↓
"As an additional cost to cast this spell, discard X cards."
+1 more matching line
Sickening Dreams90%
$1.11↓#14792↓0.1124.7 years↓
"As an additional cost to cast this spell, discard X cards."
Meteor Blast90%
$0.27↓#17038↓0.0710.9 years↓
"this card deals 4 damage to each of X targets."
Chandra's Pyrohelix90%
$0.09↓#13640↓0.00↓10.1 years↓
"this card deals 2 damage divided as you choose among one or two targets."
Twin Bolt90%
$0.04↓#127140.00↓11.6 years↓
"this card deals 2 damage divided as you choose among one or two targets."
Forked Bolt90%
$0.27↓#123530.2116.5 years↓
"this card deals 2 damage divided as you choose among one or two targets."
Meteor Shower90%
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"this card deals X plus 1 damage divided as you choose among any number of targets."
Jaya's Immolating Inferno89%
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Boulder Dash89%
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Arc Trail89%
$0.07↓#19825↓0.00↓16.1 years↓
"this card deals 2 damage to any target and 1 damage to any other target."