结界
在你的维持开始时,展示你的牌库顶牌。 若该牌为生物牌,且与由你操控的一个生物有共通的生物类别,则你可以施放该牌,且不需支付其法术力费用。若否,将该牌置于你的牌库底。
If you cast a card "without paying its mana cost," you can't pay any alternative costs. You can pay additional costs, such as kicker costs. If the card has mandatory additional costs, you must pay those.