Black Magic and Lorwyn Elves

Nissa, the new green walker since Garruk went full Green/Black hails from Zendikar. You know, the place with full art lands, all kinds of land interaction such as Landfall, and the enemy fetchlands? Well, on her first planeswalking adventure, she found herself on Lorwyn...

Planeswalker	Home Plane	First Visited
Gideon Jura	Theros	Bant (Alara)
Jace Beleren	Vryn	Ravnica
Liliana Vess	Dominaria	Innistrad
Chandra Nalaar	Kaladesh	Regatha
Nissa Revane	Zendikar	Lorwyn

If you haven't read some of the details of Nissa's Travels on MTGSalvation, you get a little background as to where she has traveled including some allusions to Ravnica and Mirrodin/New Phyrexia. The point to take away is the secret use of black mana and the elves of Lorwyn (which are green/black).

So, from her beginnings on Zendikar...

...to her explorations of Lorwyn...

...she has become who she is: the Worldwaker of Zendikar.