While -X loyalty costs existed since Lorwyn , Gideon, Champion of Justice was the first planeswalker to have essentially a variable positive loyalty ability where he could gain a different amount of loyalty depending on how many creatures the opponent controls
Instead, Ill go over some picks that are more broadly relevant to how the deck plays
So, thus far we know that Felothar, khan of the Abzan, or Abzans Mythic Spirit Dragon, Betor, lead the Abzan Armor EDH precon Ureni, spirit dragon of wisdom, or Eshki, leader of the Temur clan, can lead your Temur Roar Commander precon you can command your Sultai Arisen precon with the Mythic Spirit Dragon, Teval, or Kotis, leader of the Sultai clan and either the Mythic Spirit Dragon, Neriv, or Zurgo, leader of the new Mardu can be in the command zone of your Mardu Surge Commander precon
In fact, there are so many of these types of creatures (and even other permanents such as Honor of the Pure) that my Top 10 Tribal Lords list would be made up of creatures that never mention a tribe
She even has her own dedicated cookbook
