为 通贯龙炎 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！
Channeled Dragonfire deals 2 damage to any target.
Harmonize (You may cast this card from your graveyard for its harmonize cost. You may tap a creature you control to reduce that cost by , where X is its power. Then exile this spell.)
