If you’ve just started playing Card King: Dragon Wars, the tavern would be your primary source of coins. It’s as simple as fighting frequently in the tavern so you can earn more coins early on. Tougher battles would normally earn you a larger amount of coins, so don’t shy away from a challenge. Additionally, you’ll earn more coins depending on the number of stars you earn in a battle.
The main missions, in most cases, earn you Dragon Stones, but the daily missions, on the other hand, are your best bet for Dragon Coins. Go to your Missions folder to see which dailies are available – these missions refresh at midnight, local time, so this may be good reason for some players to stay up late.
There are also daily dungeon challenges you can complete, and the ones on weekdays are going to earn you runes for the most part. But it’s the Saturday dungeons that you want to focus on, as these are the ones that could give you a significant amount of coins. As such, they are more difficult, but it’s all going to be worth it at the end of the day.
Lastly, fighting in the arena in PvP battles could earn you a great number of coins once you’ve advanced far enough in rank.