[EDH][Opinions] Borborygmos Enraged

Things look like they should be alright; although I must admit it looks like you're a bit light on defenses if someone has a more aggressive deck or is somewhat resistant to your couple of board wipes.  I'm admittedly not the most versed EDH player, but in my experience you need to have a solid defense or trick to stop someone from achieving an alpha strike that will just win the game for them.  Normally I like to toss in Fog or something comparable to achieve this goal, as they tap out thinking they've overrun you or otherwise have you dead to rights, only to see you tap one, cast the Fog, and the tables turn as they're totally exposed, having over-extended in an effort to win the game.

I would actually shift a bit of attention away from Borby as he's pretty easy to pick off with instant speed removal as soon as someone gets a sniff of what you're up to.  Just a few other creatures to perhaps make your plan a bit harder to spot.  Thankfully, green has some NICE options there, and, if they're big enough, they could win the game for you on their own.  For instance, Gruul Ragebeast has actually won me a game when I paired it with Giant Adephage.  Swing, make a 7/7, fight their biggest creature, thanks for playing.

Asceticism strikes me as a bit redundant given that you have both Lightning Greaves and Swiftfoot Boots.  I'm also not really sure I see the reason for Fireshrieker other than to put onto Borby, which is really just win-more at that point.  Charmbreaker Devils also don't strike me as being the ideal way to get things out of your yard... I'm thinking Regrowth, Revive, or something to that end would be more useful.  Groundskeeper COULD be useful, but given that you already have ways to get stuff out of the yard AND have Creeping Renaissance, you could likely clear that space for something else.

Lastly, only Chandra?  I could see where Garruk, Primal Hunter or Garruk Wildspeaker could prove useful.

I very much understand that two-card combos are incredibly unlikely, but I was just trying to offer an example of the sort of thing you can manage to do that doesn't require a ton of setup in your colors - that could both remove some attention from Borby while also being a viable way to win the game.

Let me put it another way, I can see where the deck could work as currently constructed, but if you were to play against someone with white, if they're competitive enough, they could easily put Nevermore in to name your general - or more commonly you could encounter things like Terminus or Banishing Stroke that put Borby out of reach on the bottom of your library.  As currently constructed, any of those plays and you might as well just scoop.

That being said, both the Dragonlair Spider and Dragon Broodmother are welcome cards that will offer some defenses while also providing the opportunity to have some offense separate from Borby.  Remember, that green and red offer a ton of options for offense too and it takes 14 of Borby's lightning bolts to actually kill the opponent.. that's a LOT of land to discard.