public BoosterFixedContent(Booster _booster, CardPrint print)
        {
            booster = _booster;
            cardPrint = print;

            if (booster != null) { booster.FixedContent.Add(this); }
            if (cardPrint != null) { cardPrint.FixedContent.Add(this); }
        }
        public BoosterRandomContent(Booster _booster, CardSeries series, Rarity _rarity)
        {
            booster = _booster;
            cardSeries = series;
            rarity = _rarity;

            if (booster != null) { booster.RandomContent.Add(this); }
            if (cardSeries != null) { cardSeries.RandomContent.Add(this); }
            if (rarity != null) { rarity.RandomContent.Add(this); }
        }