Boom day: Card battle

Fight enemies and collect combat cards, defend your flying island from invaders, and get resources. You'll be taken to the world where the end of the world happened. The Earth cracked due to a calamity. People live on the ground with a fight for what they have. A deck of cards with various characters can be gathered. Explanation: defeat players from all over the world with the right strategy. Fight against other players with many types of islands.