法术
选择两个目标不具共通生物类别的生物。. 这两个生物各向对方造成等同于本身力量的伤害。
If either one of the creatures leaves the battlefield before Rivals’ Duel resolves, no damage is dealt to or by the remaining creature. If both creatures leave the battlefield before Rivals’ Duel resolves, the spell doesn’t resolve for having no legal targets.