Come up with a technique or strategy, and stick to it. For instance, my main deck is full of murlocs which all give eachother boosts, and I am a warrior so I can rack up shields with cards that might give me +5 shields or +2 with my hero ability, and then I have cards that deal damage based off how many shields I have. Basically, your cards should all work together.
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Proper murloc decks are too expensive when starting, you need multiple epics and legendaries as well as League of Explorers if you want it to work well.