Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Fireblast

You may sacrifice two Mountains rather than pay this spell's mana cost.
Fireblast deals 4 damage to any target.

Defender
{T}: Thermo-Alchemist deals 1 damage to each opponent.
Whenever you cast an instant or sorcery spell, untap Thermo-Alchemist.

Incinerate deals 3 damage to any target. A creature dealt damage this way can't be regenerated this turn.

Whenever you cast a noncreature spell, Firebrand Archer deals 1 damage to each opponent.