MBT has been talking about this idea for a bit, and this is the result: a custom-designed sealed format. This is the first part of the series and involves the release of a “core set” of cards (a handmade cube, basically). The cards in this core set will remain permanently available while cards from other sets, which will be released in waves, will rotate out. It’s basically kind of like - may God forgive me for even uttering the word - how Hearthstone handles it. The core set is linked in the description of the video.

I think it’s a super interesting concept. There’s going to be tournaments held using this core set/any future sets, and I definitely intend to try my hand at some brews.