So the Death element has the Boneyard and the Bonewall, so why not a Bone-weapon? This came to me last night, and I thought I'd put it out there to see what the reaction is...
Bone Thrower
Cost: 6 Death
Deals 4 damage at the end of each turn.
Ability: Catapult (1 or 2 death)
Sacrifice a creature (or maybe just a skeleton) to deal damage equal to its attack power to your opponent. This ability bypasses shields.
Could be an interesting twist, and it gives you something to do with all those skeletons, as well as fuels your Vultures and Bonewalls.
What do you think?