What mono-black win-cons should I put in my Braids Aristocrat deck?

I've just built a [braids, arisen nightmare] deck with a bunch of extra cards i had laying around. So far i have some [blood artist] and [accursed marauder] effects, free sacrifice outlets, tons of recursion, and even a [sheoldred, whispering one] [grave pact] and [Butcher of malakir] but I'm looking for something that'll close out the game when i play it, as opposed to beating people down bit by bit. Any suggestions? I already have [Bolas's citadel] and the [sanguine bond] [exquisite blood] combo. What else is there? Any infinite sacrifice shenanigans? Splashy big spells that'll kill the table (or even just one person) if I get to untap with them? Thanks!