Goblin lairs sit high in Jund's mountains. This gives the goblins easy access to the sacrificial peaks above and lets them build up a head of steam before attacking prey down below.

Shards of Alara

Goblin Mountaineer

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)

The only thing worse than a goblin is a goblin that knows his way around.

Ninth Edition

Mountainwalk (This creature is unblockable as long as defending player controls a Mountain.)

Goblin mountaineer, barely keeps his family fed.

Starter 1999

Mountainwalk (This creature is unblockable as long as defending player has a mountain in play.)

Portal Second Age

Mountainwalk (If defending player has any mountains in play, Goblin Mountaineer can't be blocked.)