The masks float downstream toward the Mirrorlake, where faces arise to wear them.

Tarkir: Dragonstorm Commander

Reflections of Littjara

As this enchantment enters, choose a creature type.
Whenever you cast a spell of the chosen type, copy that spell. (A copy of a permanent spell becomes a token.)

The Lost Caverns of Ixalan Commander

As Reflections of Littjara enters the battlefield, choose a creature type.
Whenever you cast a spell of the chosen type, copy that spell. (A copy of a permanent spell becomes a token.)