The game's cards are set in. If you're creating a deck of cards, the more you have from the same set, you'll get more bonuses and buffs you'll get from them.
This means that using random cards from various sets is significantly less efficient than equipping cards from the same set.
This does not imply that all 6 cards have to be of the identical set. You may choose to use as few as two or as much in the range of six from one set. The type of cards you choose to use is entirely dependent on what type of bonus and effects you'd like for your character.
When you're inserting cards into your deck, make sure to click on"Set Effect Details" when you're putting them into your deck "Set Effect Details" option over the set of cards to see the benefits the set offers you. This will help you select the card Sets you'd like to have to have in your deck.
How to Get New Cards
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