- When you receive cards you already own, they will be turned into [Duplicate Cards]
- The number of [Duplicate Cards] will be displayed on the top right corner of the respective card in the Collection
- You may gift [Duplicate Cards] to your friends
- Receiving [Duplicate Cards] will increase the number of card stars by the number of its rarity. Receving [Golden Cards] will double the amount.
- Use card stars from duplicate cards to open Card Star Chests for bountiful rewards.