Have you considered replacing the 3
Undying Evil with Power Conduits. I mean your creatures are undying already why waste a spell on them. The
Power Conduit on the other hand can grant you immortal creature because you can simply remove the counter on them and trigger the ability again and again.
Bone splinters work great for that typ of deck but if you want a alternative I just can recommend
Tragic Slip. This'll work just as fine without chewing as drastically trough your creatures.