From a classical standpoint, I found this deck, and most particularly the companion book of definitions, a disappointment.
Tarot is especially associated with Qabalistic symbols as keys to accessing the unconsious. These keys are ancient and have built up with them energies that provide tested and true pathways into the inner worlds.
One might try to associate the artwork in this deck with those traditional symbols and use them to forge new pathways. The problem, clearly, is that the artwork is lacking in enough detail to even come remotely close to beginning such an association.
If you are experienced in Qabalistic symbolism and have studied the classics enough to overlook the lack of real detail in this deck, you could, with effort, use the deck as a sort of possible vague stimulous for magical work. Unfortunately, while a pretty deck, the Atavist Tarot is more a dreamy curiosity better suited for fortune telling, rather than a real working tarot, and it's asscociated companion book is a shallow skate over the surface of what is really an ocean of immeasurable depth.