Cards that are currently Historic-legal probably won’t appear in this set.

Cards that appear in Kaladesh or Amonkhet Remastered probably won’t appear in this set.

With that being said, there are a few things that I can say with the utmost confidence:

With zero information on the actual set, nothing here can be confirmed as set in stone. We’ll keep you updated here as soon as we get some, though. There are currently no spoilers out for Pioneer Masters. While there was previously no distinction between Pioneer and Historic as formats, the recent developments in Historic lead towards them being entirely different formats. The set will be available to draft and in packs on MTGA and for constructed play.

There’s no indication of what will be in the set, other than a selection of curated Pioneer cards to add to Arena. Pioneer Masters has little confirmed info, and its previously projected release in 2021 has been scrapped in favor of “growing that unique identity for Historic.” WotC said that they still have plans for Pioneer on MTG Arena and that some steps will be taken towards it while developing Historic, but its progress has been paused for now.

Pioneer and Modern: Battle to the Death (Or Not).

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