It's also good on the turn you drop it
Big Score is excellent in decks that copy spells, as youre only required to discard the card as a cost to cast the initial spell
Lucky for us, Casualties of War is even better here, because Jund is slower than RB, and also has enchantments worth to kill (Trail of Crumbs)
As with most things in Magic, however, I encourage you to do your own research on Gatherer or Scryfall as well there are a lot of blue mass removal spells beyond those in this post, and while they will generally be the best options for many blue Commander decks, some metagames and strategies can allow you to benefit a lot from a niche effect or specialized variation
Simply put, the simple, focused strategies usually do the best, and it's hard to do much simpler than Counter-Burn
Bruvac is an advisor , so decks that rely on Persistent Petitioners are much better because you can also tap Bruvac, and youll mill 24 cards per activation instead of 12