The Forges of Asorath

The Forges of Asorath enters the battlefield
tapped.
Other lands you control don't untap for as long
as The Forges of Asorath is on the battlefield.
{t}: Add {r} for each artifact you control. Activate
this ability only if you control 5 or more lands.
"Deep inside the mountain the sound of hammers is
heard, echoing like thunder inside the deep caverns."