Frontier Siege [Commander 2017]

Set: Commander 2017 Type: Enchantment Rarity: Rare Cost: {3}{G} As Frontier Siege enters the battlefield, choose Khans or Dragons.• Khans — At the beginning of each of your main phases, add {G}{G}.• Dragons — Whenever a creature with flying enters the battlefield under your control, you may have it fight target creature you don't control.