Earth Sapta

The Earth Sapta is a drink created to bind one's spirit to the elements. Fused with magic, the potion will allow the strong willed to see the earth elements as no one else can. Your spirit will be connected to the earth, and only a select few shaman know the recipe. Using the potion grants Sapta Sight.

Source
The Earth Sapta is given to shaman when they start one of the Call of Earth quests:
 * for Tauren
 * for Orcs and Trolls