为 灵龙涡心 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！
: Add .
: Add one mana of any color. Spend this mana only to cast a Dragon spell or an Omen spell.
, , Sacrifice this land: Search your library for a Dragon card, reveal it, put it into your hand, then shuffle.
