Dominion.GameConfigBuilder.KeepOnlyKingdomCard C# (CSharp) Method

        public static void KeepOnlyKingdomCard(HashSet<Card> setCards)
        {
            var cardsToRemove = new List<Card>();
            foreach (Card card in setCards)
            {
                if (!card.isKingdomCard)
                    cardsToRemove.Add(card);
            }

            foreach (var card in cardsToRemove)
            {
                setCards.Remove(card);
            }
        }