When you play Splinterlands you have 3 ways to earn DEC. You get them as rewards when completing a quest. You get them as season rewards or you get them while winning games.
The amount of DEC is linked to the level you have. The higher league you play, the more DEC you are going to earn and the more rewards your are going to receive.
The factors that define your DEC earnings
When you play the game, your DEC earnings depend on several factors. First you only earn when you win. Then there is the capture rate that defines how much you can earn and then there are some bonuses that will boost your income.
The capture rate
The capture rate is a number that will multiply your income. With every game that you play this capture rate will decrease and with it your DEC income. Your earnings per victory is maximal when your capture rate is close to 100%. This capture rate is refilling organically over time. Try to keep your capture rate as high as possible but make sure that it never stays at 100%. You want to know why? check out this great article by 
Win streak
If you win 3 or more games in a row, you will get a bonus in your DEC earnings. The longer your win streak, the bigger your bonus.
Bonus cards
If you play alpha, promo or gold foil cards, you will get a bonus of 10% for each of the cards that you play. If you play for example a gold foil alpha card you will get a 20% (10 + 10) bonus. You can use several cards and thereby increase your bonus.
Guild bonus
If you are a member of a guild that has a developed Guild Hall you will get a Guild bonus for every one of your wins!
My tips to increase your DEC earnings
Victory over daily quest
Always try to make winning a priority while you play. If you need to play a certain splinter for your daily quest and you know you can't win with a given rule set, play another splinter that will allow you to win. If you lose, you loose your win streak and you loose also capture rate.
Use Bonus cards
When you rent cards, try to rent cards that will give you bonuses: Alpha, Promo and Gold Foil cards.
Play early in the season
There is a reward pool that is distributed among all the players. The thing is this reward pool is much fuller at the beginning of a season. If you play early, you can earn more. You can also profit from lower rental prices at the beginning of a season.
I believe these tips will allow you to increase your DEC earnings in the long run!
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