CardGame.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public static class IListExtensions {
    public static void Shuffle<T>(this IList<T> ts) {
        var count = ts.Count;
        var last = count - 1;
        for (var i = 0; i < last; ++i) {
            var r = UnityEngine.Random.Range(i, count);
            var tmp = ts[i];
            ts[i] = ts[r];
            ts[r] = tmp;
        }
    }
}

public enum Suit { None, Diamonds, Hearts, Spades, Clubs }

public enum CardValue
{
    Joker, Ace, Two, Three, Four, Five, Six, Seven, Eight, Nine, Jaques, Queen, King, 
}

public class Card
{
    public CardValue Value { get; }

    public Suit Suit { get; }

    public Card(Suit suit, CardValue value)
    {
        Value = value;
        Suit = suit;
    }

    public override string ToString()
    {
        return $"{Enum.GetName(typeof(CardValue), Value)}{(Suit == Suit.None ?  string.Empty : $" of {Enum.GetName(typeof(Suit), Suit)}")}";
    }
}

public class CardFactory
{
    public IEnumerable<Card> GetSuit(Suit suit)
    {
        var cards = new List<Card>();
        var cardValues = Enum.GetValues(typeof(CardValue))
                             .Cast<CardValue>();

        foreach(var cardValue in cardValues)
        {
            if(cardValue != CardValue.Joker)
                cards.Add(new Card(suit, cardValue));
        };

        return cards;
    }

    public IEnumerable<Card> GetDeck(bool withJokers = false)
    {
        var cards = new List<Card>();
        var suits = Enum.GetValues(typeof(Suit))
                        .Cast<Suit>();

        if(withJokers) 
        {
            cards.Add(new Card(Suit.None, CardValue.Joker));
            cards.Add(new Card(Suit.None, CardValue.Joker));
        }

        foreach(var suit in suits)
        {
            if(suit != Suit.None)
                cards.AddRange(GetSuit(suit));
        };

        return cards;
    }
}

public class CardGame : MonoBehaviour
{
    public int DeckAmount = 2;

    public List<Card> Cards = new List<Card>();

    void Start()
    {
        var cardFactory = new CardFactory();

        for (int i = 0; i < DeckAmount; i++)
            Cards.AddRange(cardFactory.GetDeck(withJokers: true)); 

        Cards.Shuffle();
        Cards.ForEach(Debug.Log);
    }
}