This deck is part of my personal league format, where all cards in a set are divided among leaders, then the decks play each other. It's only competitive through that lens, and to the extent that cards should or should not be played, know almost all cards in every set are played.
This was the third deck created for League 2, the Shadows of the Galaxy league. It has only cards from that set. This is that league's underworld deck and, to this point, is totally untested. League 2 play will start soon.