Frontier Siege

As this enchantment enters, choose Khans or Dragons.
• Khans — At the beginning of each of your main phases, add {G}{G}.
• Dragons — Whenever a creature you control with flying enters, you may have it fight target creature you don't control.

Tarkir: Dragonstorm Commander

Starter Commander Decks

Commander 2017

As Frontier Siege enters the battlefield, choose Khans or Dragons.
• Khans — At the beginning of each of your main phases, add {G}{G} to your mana pool.
• Dragons — Whenever a creature with flying enters the battlefield under your control, you may have it fight target creature you don't control.