5Clash Royale card guide
Balloon is a flying win condition that only targets buildings. Once it reaches the tower it deals massive damage, and it drops a bomb when it dies.
As Balloon floats toward the tower, add a tank in front (Lava Hound, Giant, Ice Golem) or a support card like Lumberjack to split the defense. Baiting out your opponent's air defense first greatly increases the chance Balloon connects. Freeze and Rage make its damage even more explosive.
Cards that deal with it efficiently:

This card has a hero form. The hero is active in your deck’s 2nd (Hero) or 3rd (Wild) slot. The Hero slot unlocks at Arena 5.
ElixirDeck automatically takes your unlocked evolutions and heroes into account: build your decks.