As revealed on the Weekly MTG stream, the cards are: Cecily, Haunted Mage (Eleven, the Mage) Bjorna, Nightfall Alchemist (Lucas, the Sharpshooter) Arvinox, the Mind Flail (Mind Flayer, the Shadow) Wernog, Rider's Chaplain (Will the Wise) Sophina, Spearsage Deserter (Chief Jim Hopper) Othelm, Sigardian Outcast (Mike, the Dungeon Master) Hargilde, Kindly Runechanter (Dustin, Gadget Genius) Elmar, Ulvenwald Informant (Max, the Daredevil) Havengul Laboratory Mystery (Hawkins National Laboratory Upside Down) One very important thing to note is that, unlike the Ikoria: Lair of Behemoth Godzilla cards, or Innistrad: Crimson Vow's Dracula cards, these make absolutely no reference to their Stranger Things origins
Anyway, that's all for today
You used to be able to use this to lock someone out from casting countermagic on the turns Islands were phased out, but that doesn't seem to work much anymore with the number o f non-basics out there
A reworking of the virtually unplayed Warrior Angel from the Stronghold set, the Exalted one hits the board turn three, starts swinging for an 8 life differential each turn starting turn four, and ends the game shortly thereafter