为 U.S.Agent, John Walker 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！
When U.S.Agent enters, create a colorless Equipment artifact token named Sturdy Shield with "Equipped creature gets +1/+2" and equip . Attach it to U.S.Agent.
