I built a lifegain shell with the Soul Sisters and other similar cards to refill my lifepool along with Killian's life style along with some mild stax creatures like Leonin Arbiter and Drannith Magistrate.
Effects like Dark Confidant and Ad Nauseam as the average CMC in the deck is 1.5 so you can refill your hand with them along with your other card draw. I would love more Dark Confidant style cards and I initially thought Keen Duelist did that because I misread it. Sad. Phyrexian Arena wouldn't work with Lurrus.
In my testing I still wanted more lands so I added Land Tax and Sword of the Animist which have both helped a lot. I would like to add the new Archaeomancer's Map but it's a 3 drop.
Slaughter seems super good with this setup. Repeatable killing of most creatures for 2 mana along with a life fee you can normally pay. In a normal EDH game Curtains' Call with Killian out is pay one black - destroy two creatures, worst case scenario with Killian it costs 3. This deck runs a ton of removal so my goal with it is to get rid of opponent's value creatures and protect Killian to get him through with Blackblade Reforged or Inquisitor's Flail along with some value auras for lethal. Hatred seems really good, can wipe 1 player turn 3 but it's not particular to my build, just overall good with Killian.
I considered some flicker or return from the graveyard all creatures that died effects like Acrobatic Maneuver and Brought Back but ultimately decided the value I got from those would be worse because I'd lose a lot of auras. I considered Faith's Reward but I'm not sure how often I'll have 4 mana sitting open since I will want to be setting tempo I think, same for Flickerform but I would love a cheaper targetable instant that did this and saved auras as well, not sure if it exists. For creatures that I cut I considered Thalia, Guardian of Thraben since Killian's passive would make her tax effect worse on my enemies than me but once again cut her for tempo reasons.
Decklist
Commander (1)
Creature (21)
Artifact (10)
1 Sol Ring
Sorcery (7)
Sideboard (1)
Approximate Total Cost:
I considered a more equipment-y build for him with low cost, high equip value like Colossus Hammer to get around Lurrus but ultimately discarded it though this may be good and I just am not valuing it enough. https://www.moxfield.com/decks/M9VqJz57LE2ohqjyg2MGUg
Any comments or suggestions would definitely be welcome.