Fireball is a 4-elixir card. BihmanDecks classifies it for spell, big spell, anti swarm based on its reviewed strategic taxonomy.
Fireball Clash Royale card guide
Official Fireball facts plus reviewed BihmanDecks deck-building roles, related cards and supported decks.

Official card data
Card ID: 28000000
Elixir: 4
Rarity: rare
Type: Unavailable
BihmanDecks analysis
SPELLBIG SPELLANTI SWARM
This analysis is BihmanDecks-derived, not official Supercell data.
Related cards

Princess
legendary · 3 elixir
BAITRANGEDANTI SWARMEVOLUTION
Fire Spirit
common · 1 elixir
CYCLEANTI SWARMUTILITY
Mother Witch
legendary · 4 elixir
RANGEDANTI SWARMSUPPORT
Arrows
common · 3 elixir
SPELLSMALL SPELLANTI SWARM
Rage
epic · 2 elixir
SPELLSMALL SPELL
Rocket
rare · 6 elixir
SPELLBIG SPELLSupported decks
Official sample · Control
Use the deck’s highest-value defender to create counterpush pressure around its win condition.
Official sample · Control
Use the deck’s highest-value defender to create counterpush pressure around its win condition.
Official sample · Control
Use the deck’s highest-value defender to create counterpush pressure around its win condition.
Official sample · Hog Rider
Use low-cost defense and pressure when the opponent’s Hog counter is out of cycle.
Official sample · Lava Hound
Use the deck’s highest-value defender to create counterpush pressure around its win condition.