The Jerall Mountains

The Jerall Mountains enters the battlefield tapped.
{t}: Add {g}, {u}, or {r} to your mana pool.
Hammergust, the Snowy City, lies nestled in the Jerall Mountains near the northern border. Alessia Ottus accurately notes in her Guide to Hammergust that the city "is more Dwarf than Human," but unsurprisingly complains of the "terrible cold and discomfort" and accuses the citizens of drunkenness three times.