Tasigur.

Bump in the Night? It's another bolt that makes use of your black.

Oops, didn't see you already had one.

It's already in there as a 4x. BanBlueEDH

It's "viable" in the sense that it can probably win games, but it's strictly worse than the naya version.

What you lose switching from naya to jund burn:
Kor Firewalker meaning your mirror match % is worse
Path to Exile meaning your % is significantly worse against several matchups
Boros Charm which is a 4 of in most naya decks
Deflecting Palm which is at least a 1 of in most decks

Don't get me wrong, that doesn't automatically mean it's not worth it, but what do you gain in return?
Bump in the Night as a 4 of to replace Boros Charm, which is a better damage/mana ratio, but not nearly as capable of handling different situations.
Abrupt Decay in sideboard which goes completely against the Burn philosophy and likely weakens the deck. (Every card is supposed to be able to damage the opponent)
Rakdos Charm which isn't as good as say, Destructive Revelry for artifact/enchantment removal, and you definitely don't need both.
Kolaghan's Command just isn't a burn card. A maximum of 2 damage total for 3 mana investment is a bad play for burn.

To remind you, burn's ultimate goal is to come as close to possible as casting a Lightning Bolt with each card. It's all about how much damage per mana you can get. Bolt sets the standard at 3 for 1, which is why goblin guide is so good because it's often 4 for 1, and occasionally more. I can understand wanting to trade to Bump in the Night for this reason, and maybe it would work, but it won't be better than Naya burn.

A considerable number of people have spent a considerable amount of time crunching the numbers and figuring out the best Burn stock list, and right now it seems to be Naya. You can have success with other lists, but I don't see why you'd spend $600 buying a sub-par Burn list when the whole point of Burn is to be as efficient as possible.

Khaosknight All of those are valid points. But, with dragon's claw in the side and the fact that they won't have a way to remove it until game 3 I don't think that my mirror is worse without Kor Firewalker. Also, Abrupt Decay doesn't do damage, but neither does Path to Exile. They would rather have me play path than decay because they get land out of it. I think that Bump in the Night for Boros Charm is an ok trade off. I don't think either is strictly better than the other. You are right about the sideboard, though. Rakdos Charm and Kolaghan's Command aren't as good as Deflecting Palm.

Why would mirror not have a way to remove dragons claw until game 3? and the difference is Abrupt Decay costs 2 mana and path costs 1, so on the turn you use path you can also do something else. Also, path can be used on your own creatures and help fix your mana if needed.

Like I said, you could make Jund work, but it won't be optimal. And personally, I feel like the whole point of Burn is to find the most efficient way to count to 20, so if you're purposefully choosing a less efficient way and not really getting anything in terms of budget or fun out of it, it's not worth it.

Typically they would board in path, but even if they do board in revelry, then their answer costs 2 mana just like decay. The only matchup that is slightly worse is the mirror. If anything, the mainboard is more efficient because I have more 1 drops and fast lands that don't hurt. The main board of this deck is on even ground with Naya, but the sideboard is slightly worse. Only because of Deflecting Palm and Path. Path only matters against maybe Kitchen Finks and things like bloom titan because I can bolt most things. Palm is just freaking cool vs. infect, boggles, bloom, and affinity and we have Ensnaring Bridge to make their big, un-boltable things obsolete.

You know, I've seen a list or two on here that runs a couple Tasigur, the Golden Fang instead of Lavamancer.. Something to think about..

I also play Jund Burn, somehow I also prefer this one to the Naya one. Before Jund I play Boros Burn, having white card certainly is good but it has its own bad matchup too.

Consider using 4 of Self-Inflicted Wound against Goyf and Boggle. Ensnaring Bridge is useful against Eldrazi TRON.