Clash of cards event is card collecting event where you collect different types of cards. Collect card packs and trade your cards to get more cards. When you collect enough cards you earn rewards.
Event runs from August 1 to August 31. After that time you can still trade your card for extra two days. When trading closes you can view your collection by tapping card collector decoration.
You can get card packs from these:
You can also use trading to get new cards:
Trading with others:
Trade your duplicates with your clanmates. Make a trade offer in your collection, choose which card you want and which card you offer. You or your friends can complete trade by using duplicates or with gems.
Rewards:
10 different Cards: Book of Cards Decoration
Collect 20 different Cards: 5,000 Shiny Ore
Collect 30 different Cards: 500 Glowy Ore
Collect 40 different Cards: 50 Starry Ore
Collect 50 different Cards: 2 Builder Potions
Collect 60 different Cards: Manga Fury Prince Skin (NEW!)
Collect all Elixir Cards: Rune of Elixir
Collect all Dark Elixir Cards: Rune of Dark Elixir
Collect all Builder Base Cards: Rune of Gold
Collect all Super Troop Cards: Legendary Chest