Method getValidRarities

forge-game/src/main/java/forge/game/Game.java:1145–1158

(final Iterable<Card> cards)

    }

    private static Set<CardRarity> getValidRarities(final Iterable<Card> cards) {
        final Set<CardRarity> rarities = new HashSet<>();
        for (final Card card : cards) {
            if (card.getRarity() == CardRarity.Rare || card.getRarity() == CardRarity.MythicRare) {
                //Since both rare and mythic rare are considered the same, adding both rarities
                //massively increases the odds chances of the game picking rare cards to ante.
                //This is a little unfair, so we add just one of the two.
                rarities.add(CardRarity.Rare);
            } else {
                rarities.add(card.getRarity());
            }
        }
        return rarities;
    }

    public void clearCaches() {
        lastStateBattlefield.clear();