In addition to The Master Ring, you can also expect to find the lesser Rings of Power in the set, as the iconic and ever-useful Sol Ring is being reprinted in a variety of stylings to represent the treacherous artifacts gifted to the enemies Mairon in the Third Age
This additional step to the printing process has added more room for error, which is something misprint collectors like us love
Notably, Sultai Arisen also breaks the trend of Spirit Dragons being awful in the precon, with Teval actually supporting the graveyard strategy (and the main deck Teval is also great in it)
Serra Redeemer The Dominaria United soldiers deck will love Serra Redeemer
One cannot possibly lump all these decks together as one when discussing sideboarding plans, but I think that its more or less okay to do so when talking about strategic basics when discussing playing against this kind of deck
Finish games with massive drains from Exsanguinate, Gray Merchant of Asphodel, or Corrupt
