Voltage Surge 
Instant
$0.15 #19821 0.11 4.5 years
As an additional cost to cast this spell, you may sacrifice an artifact.
Voltage Surge deals 2 damage to target creature or planeswalker. If this spell's additional cost was paid, Voltage Surge deals 4 damage instead.
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Cards similar to Voltage Surge 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.
Shrapnel Blast94%
$0.25↑#180790.00↓22.9 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
+1 more matching line
Incendiary Sabotage92%
$0.05↓#27174↓0.27↑9.9 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
Artillerize91%
$0.10↓#232350.00↓15.3 years↑
"As an additional cost to cast this spell, sacrifice an artifact or creature."
+1 more matching line
Shivan Fire88%
$0.13↓#232400.00↓8.4 years↑
"this card deals 2 damage to target creature. If this spell was kicked, it deals 4 damage instead."
Unholy Heat88%
$0.28↑#9059↑0.185.2 years
"this card deals 2 damage to target creature or planeswalker."
Chandra's Triumph87%
$0.14↓#172710.217.3 years↑
"this card deals 3 damage to target creature or planeswalker an opponent controls. this card deals 5 damage instead if you control a Chandra planeswalker."
Stonesplitter Bolt86%
$0.18↑#12010↑0.27↑3.0 years↓
"this card deals X damage to target creature or planeswalker. If this spell was bargained, it deals twice X damage to that permanent instead."
+1 more matching line
Flame Discharge86%
$0.09↓#210560.00↓4.5 years
"this card deals X damage to target creature or planeswalker. If you controlled a modified creature as you cast this spell, it deals X plus 2 damage instead."
Kuldotha Rebirth86%
$0.25↑#13389↑0.23↑15.9 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
Powerstone Fracture86%
$0.09↓#189510.00↓3.8 years
"As an additional cost to cast this spell, sacrifice an artifact or creature."
Firecannon Blast85%
$0.05↓#229630.47↑8.9 years↑
"this card deals 3 damage to target creature."
Improvised Club84%
$0.17↑#181380.00↓3.2 years↓
"As an additional cost to cast this spell, sacrifice an artifact or creature."
+1 more matching line
Frost Bite84%
$0.18↑#207840.00↓5.6 years↑
"this card deals 2 damage to target creature or planeswalker. If you control three or more snow permanents, it deals 3 damage instead."
Burst Lightning84%
$0.18↑#5513↑0.53↑16.9 years↑
"this card deals 2 damage to any target. If this spell was kicked, it deals 4 damage instead."
Roil Eruption84%
$0.12↓#209010.175.9 years↑
"this card deals 3 damage to any target. If this spell was kicked, it deals 5 damage instead."
Iroas's Blessing84%
$0.07↓#225500.00↓6.6 years↑
"When this Aura enters, it deals 4 damage to target creature or planeswalker an opponent controls."
Goblin Barrage83%
$0.22↑#218600.208.4 years↑
"this card deals 4 damage to target creature. If this spell was kicked, it also deals 4 damage to target player or planeswalker."
Demon Bolt82%
$0.22↑#10716↑0.125.6 years↑
"this card deals 4 damage to target creature or planeswalker."
Sear82%
$0.29↑#14921↑0.00↓0.6 years↓
"this card deals 4 damage to target creature or planeswalker."
Thundering Rebuke82%
$0.11↓#176080.64↑5.9 years↑
"this card deals 4 damage to target creature or planeswalker."