Flying Whenever Drana, the Last Bloodchief attacks, defending player chooses a nonlegendary creature card in your graveyard
This is a little objective and there are certainly others worthy of top 10 consideration, but your black deck may improve by including any of these black tutors legal for the format: #1 Demonic Tutor Demonic Tutor is widely considered to be one of the best tutor cards in the game
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
For both GRN and RNA, I was missing about 30 Uncommons out of the 320 total
