mixedcards/Assets/Battle/BattleSetup.cs

using UnityEngine.SceneManagement;

public class BattleSetup {
    private static BattleParameters sParameters;

    public static void StartBattle(BattleParameters parameters) {
        sParameters = parameters;
        SceneManager.LoadScene("BattleScene");
    }

    public static BattleParameters RetrieveParameters() {
        BattleParameters result = sParameters;
        sParameters = null;
        return result;
    }
}