为 暗黑之云 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！
Flying
Particle Beam — When Cloud of Darkness enters, target creature an opponent controls gets −X/-X until end of turn, where X is the number of permanent cards in your graveyard.
