Use Fireball to take out medium-health support cards like Musketeer, Wizard, Barbarians or Witch. You get the best value when you hit a troop and the tower at the same time. It also finishes towers late in the game.
Tips
Aim Fireball so it hits a troop and the tower together.
It wins big elixir trades against cards like Three Musketeers or Barbarians.
When targeting fast troops, predict where they'll be.
Strengths
Clears medium-health support cards.
Also damages the tower; very versatile.
Weaknesses
Can't kill very sturdy cards.
Costs you elixir when used on cheap cards.
Playing against this spell
Cards that help when your opponent has this spell: