Sure, the odd card or two will break through, and inevitably there will be a stand-out that either refines or enables a new strategy, but these can generally be counted on one hand per set release
I do appreciate how broad it is, but hopefully you can just play Sephiroth's Intervention or Fate of the Sun-Cryst instead
Fireblast was particularly important in this deck for combating Bloom-Drain decks, on account of its strength against Natural Balance
If you need full playsets of rares and mythics, the bundles are a solid deal
Those days are long gone, although in the early days of Magic Arena I would see posts on blogs and reddit about how to most effectively complete your Arena collection for each set
Korvold is a great choice for anyone that wants to sacrifice their own stuff, and for me, is one of the best commander cards mtg has to offer for aristocrats lovers