Beln Deckling

@charliedastrike I do play Teferi's Puzzle Box in my own version of this deck(just running a budget version), it's very good, I'll add it here. Incendiary Command sounds great, as for the other ones, I'll keep them as suggestions but I like to keep the deck diversified, I feel adding too many wheels will make the deck too straight forward ? Maybe I'm wrong hehe.

@law579 Thanks, definitely will fit at least 2 of those in.

Small Update, this deck is evil, my EDH group got very mad at me haha.

Build this at your own risk, it'll probably turn into a 3v1 against you.

I may run a toned down version with a different commander like Nicol Bolas just so people aren't screaming their lungs out when I play Nekusar, and add more copy spells/abilities.

@Timmmmey Thanks for the suggestions I'll definitely add those in there, and yeah the card count was off I wasn't sure what to remove.

@Burntrol Thanks and yes you are right Nekusar will be a bit flimsy out there. I made room for 2 more lands and removed some planeswalkers.

Also since you play Urborg, Tomb of Yawgmoth, I' would totatlly put Filth in your deck and give Swampwalk (Unblockable) to all your dudes. You may not want to waste Entomb on Filth but if you get Buried Alive I would get him in the grave if you have the land.

Even though it's "Mono-Black" you can still have creatures of other colors in your deck since this is legacy.

I'd suggest playing Iona, Shield of Emeria, it's pretty good to shutdown anyone until you get another card to finish them off.

Another good card to have is Jin-Gitaxias, Core Augur which will give you all the card advantage you can wish for.

If you fear for your life you can also have a Platinum Emperion in there.

Make all your permanents indestructible with Avacyn, Angel of Hope

As for what to remove, I would say : Demon of Death's Gate, Grave Titan,Necropolis Regent. They're good, but there's better for this deck.

Not sure about Ob Nixilis, Unshackled, have you play-tested him ?

Hope you have fun, it's one of the best legacy decks there is for the price.