MTG Salvation

I'm in need of a list of all of them, including slivers, as I am building a tribal Tribe edh deck with Mistform Ultimus at its helm.

I'm pretty sure, without even checking, that you can google "Mistforum Ultimus EDH" and find a list that contains all of them.

Grand Architect.
Adaptive Automaton.
All the Merfolk lords (Lord of Atlantis, Meerow Rejeery, Coralhelm Commander, Master of the Pearl Trident, Merfolk Sovereign.)
Scion of Oona.
Myr Matrix, Myr Galvanizer.
Lord of the Unreal.
Long-Forgotten Gohei.
Master of Waves.

Non-creature tribal buffs like Hall of Triumph and Gauntlet of Power and Caged Sun and Door of Destinies. (And Thran Weaponry, ick.)

Konda's Banner is good on Mistform.

Sunken City. (Heh.)

I don't think there are any blue or colorless Slivers that are considered "Lords" (+X/+X abilities) but there are a few good blue Slivers. Shifting Sliver, Psionic Sliver (with buffs), Synapse Sliver, Galerider Sliver, Synchronous Sliver.

The voltron umltimus list in this site's database includes all of the tribal equipment from morningtide.

Don't forget Brass Herald! And...ALL CLONES.

Sun Quan, Lord of Wu and Archetype of Imagination

Sage of Fables, sort of. Caged Sun is definitely worth a mention, as well as Gauntlet of power, Hall of Triumph. Coat of Arms Gives Mistform +1/+1 for every single other creature, and gives each other creature at least +1/+1 from sharing with mistform.

Most of these have already been mentioned, but here:

• Coralhelm Commander
  
• Grand Architect
  
• Lord of Atlantis
  
• Lord of the Unreal
  
• Master of the Pearl Trident
  
• Master of Waves
  
• Merfolk Sovereign
  
• Merrow Reejery
  
• Scion of Oona
  
• Hall of Triumph
  
• Caged Sun
  
• Gauntlet of Power
  
• Adaptive Automaton
  
• Brass Herald
  
• Myr Galvanizer
  
• Sunken City
  
• Eldrazi Monument
  
• Konda's Banner
  
• Long-Forgotten Gohei
  
• Myr Matrix
  
• Coat of Arms
  
• Door of Destinies
  
• Sun Quan, Lord of Wu
  
• Archetype of Imagination
  
• Akroma's Memorial