Legendary Creature - Knight Vampire Creature (CTRL to add secondary) Drain Sorin of House Markov Lifelink Extort (Whenever you cast a spell, you may pay
Junk Diver Junk Diver can be used in a lot of combos involving artifact sacrifice since you get some recursion if it dies
There are the cheap but dependable blue Auras like Frogify, Kasminas Transmutation, and Deep Freeze that can nullify enemy Commanders
Optional: Power/Toughness (if applicable, such as Vehicles or Artifact Creatures) 5
Personally, I'd toy around with using two Crobat, a pair of Darkrai ex, and Arceus ex as the basis of a deck to see if the deck can really shine as a passive damage-dealing menace
It also includes some of the reprints as appropriate so you can get a sense of how Avatar: The Last Airbender stacks up against existing commanders