So, Pox's Kjeldoran Outpost+ exsits, I love the idea of churning out army after army, and technically, this deck can have a creature presence forcing the opponent to chump Titans, so I might even satisfy it without having paid mana, the total of 4 mana needed to activate is a tad steep, but it's roughly the same as Outpost, since it didn't cost you a land forever. It's also a Legendary Land, so I don't think I'd run more than 1 or 2, but it not costing life makes it seem pretty solid. I'm not 100% sold on it yet, but it's very much worth thinking about.
In keeping with that, it'd be another truly great reason to replace my Crypt Rats with a Pestilence, a new Army token could keep it around, as could an Erebos' Titan (and I can use it with a Phyrexian Totem pre-activation safely).
Edit: Well, I tossed in 2 Pestilence and 2 Barad-Dur, I feel like I want only 1 Barad because it's rarely great and I almost never want to see a 2nd. Pestilence seems slow, but I haven't had it in a good hand yet (very little testing so far). I pulled 2 Swamps, Crypt Rats (goodbye dear friend!) and No Mercy. I'm not sure if I'll put back in 1 Swamp and No Mercy, but No Mercy is also a very playable Commander card in more Casual metas.
Edit: Well, Pestilence is pretty interesting in here, not sure if I really need x2 with only x4 true Creatures in the deck, but the effect can be really good in here so 'we'll see'. I still miss Crypt Rats and now want to build a Crypt Rats deck so they can shine on their own, but I don't have x4 Gift of Doom yet so 'we'll see' (again). I also already have a rat deck? Who knows, I just know that I want to see if I can make Crypt Rats do work still.