From the Publisher Web:
For the first time, you can lead your forces with a Planeswalker commander in this exciting multiplayer Magic format. Dominate the battlefield with new combinations of strength and skill. Fight wisely, for only one commander will prevail.
FORGED IN STONE
Nahiri, the Lithomancer knows that victory comes from having the right weapons. This Planeswalker commander is a master of arms who creates powerful equipment and enchantments to prepare massive armies for the fight.