Voltage Surge

As an additional cost to cast this spell, sacrifice a creature or planeswalker.

Heartfire deals 4 damage to any target.

As an additional cost to cast this spell, you may blight 1. (You may put a -1/-1 counter on a creature you control.)

Cinder Strike deals 2 damage to target creature. It deals 4 damage to that creature instead if this spell's additional cost was paid.

As an additional cost to cast this spell, sacrifice an artifact or creature.

Improvised Club deals 4 damage to any target.

As an additional cost to cast this spell, sacrifice a creature.

Collateral Damage deals 3 damage to any target.

Flame Discharge 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. (Equipment, Auras you control, and counters are modifications.)

As an additional cost to cast this spell, you may reveal a Dragon card from your hand or choose a Dragon you control.

Dragon's Fire deals 3 damage to target creature or planeswalker. If you revealed a Dragon card or chose a Dragon as you cast this spell, Dragon's Fire deals damage equal to the power of that card or creature instead.