Dominion.GameConfig.CreateRuins C# (CSharp) Method

        private static PileOfCards CreateRuins(CardGameSubset gameSubset, int ruinsCount, Random random)
        {
            int ruinCountPerPile = 10;
            var allRuinsCards = new ListOfCards(gameSubset);
            allRuinsCards.AddNCardsToTop(Cards.AbandonedMine, ruinCountPerPile);
            allRuinsCards.AddNCardsToTop(Cards.RuinedMarket, ruinCountPerPile);
            allRuinsCards.AddNCardsToTop(Cards.RuinedLibrary, ruinCountPerPile);
            allRuinsCards.AddNCardsToTop(Cards.RuinedVillage, ruinCountPerPile);
            allRuinsCards.AddNCardsToTop(Cards.Survivors, ruinCountPerPile);

            allRuinsCards.Shuffle(random);

            var result = new PileOfCards(gameSubset, Cards.Ruins);

            for (int i = 0; i < ruinsCount; ++i)
            {
                Card card = allRuinsCards.DrawCardFromTop();
                if (card == null)
                {
                    throw new Exception("Not enough ruins available.");
                }
                result.AddCardToTop(card);
            }
            result.EraseKnownCountKnowledge();

            return result;
        }