Like all Commander precon decks, these are ready to play right out of the box but theres also a lot of room to optimize and improve them
There is no release date yet, but partner commanders and other hints show progress toward that goal
Translating copious amounts of colorless mana into WUBRG is going to be a challenge, and as previously mentioned, evasion will be at a premium once we actually get that WUBRG OverrunOverrun effect activated
In the end, the day/night mechanic had a bunch of problems that sunk it: It was complicated, it was wordy, it required at times tracking something that didn't matter but could, etc
There are many places where you can list your cards for sale: TCGplayer, Cardmarket ( for Europe), Cardsphere or Ebay