When one of your opponents successfully casts a creature spell, if Opal Champion is an enchantment, Opal Champion becomes a 3/3 creature with first strike that counts as a Knight.

• 当任一对手成功施放生物咒语，若蛋白石斗士此时为一结界，则蛋白石斗士成为3/3，具先攻异能，并视为骑士的生物。