The Curse of Wandering permeated Amonkhet long before Nicol Bolas. He simply harnessed it.

Dunes of the Dead

{T}: Add {C}.
When Dunes of the Dead is put into a graveyard from the battlefield, create a 2/2 black Zombie creature token.

{T}: Add {C}.
When this land is put into a graveyard from the battlefield, create a 2/2 black Zombie creature token.

{T}: Add {C} to your mana pool.
When Dunes of the Dead is put into a graveyard from the battlefield, create a 2/2 black Zombie creature token.