Voltage Surge is a common Instant card from Kamigawa: Neon Dynasty (NEO), collector number 171. Current market price: $0.12 (foil $0.19), TCGplayer market prices via Scryfall.
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.