Needs more entropy, less death. Swap the mark to death, use a few entropy pendulums, entropy pillars, then let the rest of the death be powered by soul catchers.
Boneyard is generally a poor choice, low offense, and slow. Dragons > vultures. Start out stronger, doesn't worry about reverse time as much, and no fear of lobo. Butterfly effect probably will just hurt more then help, and 3 bonewalls is probably enough.