为 驱群妖 寻找最佳的标准套牌，包括其胜率、热度，以及该牌在万智牌：竞技场中的合法赛制！
This spell costs less to cast, where X is the greatest mana value among Elementals you control.
Flying
When this creature enters, if you cast it, return all non−Elemental creatures to their owners' hands.
