Petrograd, the First Soviet

Mountains are also Soviets.
{t}Tap: Add {r} to your mana pool.
When there are 15 or more creatures in a graveyard, sacrifice this land. Dethrone the "State Oppression" emblem and place the "Dictatorship of the Proletariat" emblem in play.
After the nation's defeat in World War I, the Czar's tyranny spurred workers' strikes, creating the first soviets.