havent played mtga in a while

Im curious to know too. bump

I don't think they apply to MTG Arena. I think it's another MTG game

They're not for mtga, they're for MTGO (Magic: The Gathering Online) - MTGO is much older than MTGA, and has every set in the game, so it's played by more seasoned players that prefer older formats. It also allows good players to make actual profit.