黑市牌的规则：
Black Market allows you to Buy a card during the Action phase. You can use coins provided by other Action cards played earlier in the Action phase and you can also play Treasure cards from your hand to pay the cost of the bought card. The Treasure cards are played to the table in your play area, just as you would during the Buy phase. You may play more Treasure cards than are required for the purchase; the extra coins from Action cards and Treasure cards are available to use during your Buy phase. You may even play Treasure cards without Buying a card. You may not reuse coins already spent during a turn. A card bought during the Action phase does not count as a card bought in your Buy phase, so you do not need an action card giving you +1 Buy to still buy a card during your normal Buy phase.
