Clash Royale Decks Builder is a tool for gamers to help them build their Clash Royale Decks. Deck Builder provides 8 decks and different cards with their capabilities and costs. 

When you choose a particular card, it will show you its cost in elixir, strength, type, damage type, transport type, and more. You can choose the cards yourself or go for random ones. 

Deck Builder will also guide you on whether you acquired the cards from your opponent.