I think the best we can hope to get for BR in the next set is a Dreadbore reprint (or an Unlicensed Disintegration variant for Standard). What I expect is a good spell for BW, something like a Vindicate that doesn't target lands: that color combination needs more love in modern.
I wouldn't recommend it, since we can't protect it well and we can't cantrip it to obscene amounts of tokens and prowess (unlike Jeskai Thing Ascension, which does run a couple, but is a tier 3 deck at best). I would recommend Goblin Rabblemasters in the side for games against control, combo, rest in peace or fast Blood Moon decks, where a fast growing, must-answer Red threat is useful... and where you probably play off of your topdeck after several turns.
It's definitely a budget consideration ($50 vs $3.50, and so is Extirpate in the sideboard over Surgical Extraction), but it seems to have worked for him. In what is basically a 2 color deck, Dragonskull Summit should come untapped any turn past the first: every other mana-producing land in the deck fills its "Swamp or Mountain" obligation.
If you don't have the Cliffs, you can run Summits, but Cliffs is better. And don't try to replace the fetch or shocks with Summits: Blackcleave Cliffs and Dragonskull Summit don't play well with each other.
I Dont like of Plains in MB, Perhaps she in oppening hand makes weird.
With the amount of Blood Moon decks and WU decks with 4x Field of Ruins and 4x Path to Exile in my local meta (which tends to favor heavily control/combo/prison decks), I prefer running a 5x Basic land in place of the second Sacred Foundry. It could be a 3x Swamp, but I decided to cut Lili altogether, and Inow have no BB spell in my 75.
I would think that's a good split as well, especially after having played against Skred Red Dragons and UW Control x2 last night: having one more hard removal spell would help. However, I am wondering what to cut for the second Dreadbore: my 2 flex spots are filled by Hazoret and Liliana, the Last Hope... I guess Lili would bit the dust, as she is the only BB spell in my 75.