Looks like a cool deck, Orah seems like the commander clerics has been looking for for a long time. Combos are interesting, would suggest leaning into a couple of the more concise ones while cutting out any cards that would be dead outside of them like Shuriken. Also your lifegain combos become much more deadly with a Sanguine Bond or Vito, Thorn of the Dusk Rose so would recommend those along with a Blood Artist type effect or two. Celestial Gatekeeper seems like an odd choice, not sure if it's worth. If you want the body then Butcher is very good but I find that Martyr's Bond does a lot of work for aristocrats. Also Burnt Offering is fun ramp but Culling the Weak might be better value since there's not a ton of creatures above 5 mana in there. This is definitely a meta call too but with undying combos and Mikeaus in there, a Solemnity might be worth along with some light lifegain tax like Kambal, Consul of Allocation. Anyway, hope that helps