Kher Ridge Battlements

Enchant Mountain or legendary land.
Whenever a nontoken legendary Kobold enters
the battlefield, create a 0/1 red Kobold creature
token named Kobolds of Kher Keep.
Whenever a nonlegendary Kobold enters the battlefield, you may pay {r}. If you do, create a
token copy of that creature. Permanents created
this way don't cause this ability to trigger.