Voltage Surge 
Instant
$0.12 #20083 0.06 4.7 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 Blast95%
$0.28↑#181990.0623.0 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
+1 more matching line
Incendiary Sabotage94%
$0.04↓#27413↓0.0010.1 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
Artillerize92%
$0.04↓#234570.0015.4 years↑
"As an additional cost to cast this spell, sacrifice an artifact or creature."
+1 more matching line
Shivan Fire89%
$0.14↑#235610.078.5 years↑
"this card deals 2 damage to target creature. If this spell was kicked, it deals 4 damage instead."
Kuldotha Rebirth88%
$0.26↑#13558↑0.0016.1 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
Powerstone Fracture88%
$0.08↓#192720.073.9 years
"As an additional cost to cast this spell, sacrifice an artifact or creature."
Cinder Strike88%
$0.15↑#170580.070.7 years↓
"this card deals 2 damage to target creature. It deals 4 damage to that creature instead if this spell's additional cost was paid."
Stonesplitter Bolt88%
$0.17↑#12308↑0.123.1 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
Improvised Club86%
$0.14↑#183650.003.3 years↓
"As an additional cost to cast this spell, sacrifice an artifact or creature."
+1 more matching line
Unholy Heat86%
$0.22↑#9337↑0.065.3 years
"this card deals 2 damage to target creature or planeswalker."
Chandra's Triumph85%
$0.14↑#174140.007.5 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."
Burst Lightning85%
$0.18↑#5200↑0.36↑17.0 years↑
"this card deals 2 damage to any target. If this spell was kicked, it deals 4 damage instead."
Roil Eruption85%
$0.09↓#213070.006.1 years↑
"this card deals 3 damage to any target. If this spell was kicked, it deals 5 damage instead."
Firebending Lesson84%
$0.13↑#5975↑0.150.9 years↓
"this card deals 2 damage to target creature. If this spell was kicked, it deals 5 damage to that creature instead."
Flame Discharge84%
$0.07↓#214510.004.7 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."
Goblin Barrage84%
$0.20↑#221000.118.5 years↑
"this card deals 4 damage to target creature. If this spell was kicked, it also deals 4 damage to target player or planeswalker."
Firecannon Blast84%
$0.05↓#232470.009.1 years↑
"this card deals 3 damage to target creature."
Frost Bite83%
$0.21↑#210500.005.7 years↑
"this card deals 2 damage to target creature or planeswalker. If you control three or more snow permanents, it deals 3 damage instead."
Forge Armor82%
$0.18↑#29309↓0.0623.0 years↑
"As an additional cost to cast this spell, sacrifice an artifact."
Costly Plunder82%
$0.20↑#3481↑0.079.1 years↑
"As an additional cost to cast this spell, sacrifice an artifact or creature."