Card rewards
By default, and similarly to Slay the Spire, the kit rewards the player with a card to choose from a random selection of three after winning a battle. The selected card is then permanently added to their deck.
We use a card library named WizardRewards that contains the cards available as rewards in the game. The system responsible for managing the card rewards is named CardRewardSystem and you can specify the card library to use in the Inspector of this system.