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Choose a planeswalker you control
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
Its even banned in the Modern format
Creature - Elf Shaman Color tag templates(None) Shrieking Drake Flying When this creature enters, return a creature you control to its owner's hand
It may seem like a niche strategy initially, but it's quite solid once you have your mill commander in play and multiple of these creatures already on the table