Gonna be honest here, I think this model sucks. Skull Acne is back and worse than ever, the back legs are entirely static, and the rider looks like a badly converted Slaughterpriest who was dipped in hot glue.
Add to that the sheer nothingness of his Lore (much power, many skulls) and ridiculously OP rules (12 attacks on the rider alone and a-3 to cast???) and you‘ve got a model that I hope I never have the displeasure of seeing or facing.