Outpost Siege (Commander 2017)

Enchantment - As this enchantment enters, choose Khans or Dragons.
¥ Khans Ñ At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card.
¥ Dragons Ñ Whenever a creature you control leaves the battlefield, this enchantment deals 1 damage to any target.