Deck, Arena 10, Arena 11 Giant Royale, the Barbarians Chosen, the Spirit of the ice
The best way to get to the Arena 11, Arena Legendary, and the 4000 cups to access the Alloys of the Clash Royale is to exploit and climb into the Arena 10, Mount wild Boar, to accumulate huge experience of combat, and that's one of the best decks in circulation.