Core + 4 Series
The following are two sets of four decks each that can be built simultaneously using a single collection of the Master Set and the first four expansions that were released: The Roaring Rose, The Duchess of Deception, The Frostdale Giants, and The Children of Blackcloud. These decks can also be located by searching "Core + 4" as the title on Ashes.live.
Set A
This first group has more iconic deck types, with the exception of Leo due to how many dice of each type were left after building the first three decks.
Set B
This second group has more cards split up between the decks so each deck has at least some of the tools to deal with each other's strengths.