2Clash Royale card guide
Wall Breakers are two small bombers that run at buildings and explode on impact. They're a cheap, fast win condition.
Send Wall Breakers after your opponent spends elixir, or with cards like Miner or Goblin Drill, to damage the tower. They're fast, so your opponent has to respond right away. You can also split them across both lanes.
Cards that deal with it efficiently:

This card has an evolution. The evolution is active in your deck’s 1st (Evolution) or 3rd (Wild) slot. The Evolution slot unlocks at Arena 3, the Wild slot at Arena 10.
ElixirDeck automatically takes your unlocked evolutions and heroes into account: build your decks.