In Balatro, the deck is often the most important aspect of the run. It is the first decision the player makes, rendering certain strategies easier and others impossible. The first deck players will use is the Red Deck, with Blue, Yellow, and Green following shortly after. All other decks are unlocked by winning rounds. The easiest decks to unlock in Balatro only grant a minor bonus, like an additional hand or discard per round. Sometimes, decks come with larger rewards at a small cost, but they rarely affect the game too much.