Like I had mentioned in the description, I was only able to find the Spirit Master set from the core game. I've been unsuccessful in finding the other sets. I am also missing some expansions, but am more concerned about the core cards.

Here's what I've been able to find so far:

Core:

• Spirit Masters

Expansions:

• Blades of Ninjaka
  
• Creatures of Katrina
  
• Gothic Asylum
  
• High Council
  
• Holiday Havoc
  
• Katra bots
  
• Kommanders
  
• Legends of Knowledge
  
• Minions of Decay
  
• Silver Age of Heros
  
• Skullz of Kaos

Individuals:

• Burning Gundam
  
• Web of Knowledge

As for what I'm missing, I'm not entirely sure. I know at least I'm missing Funkadelic 70's, but I'm sure there are others. Here's an imgur post containing all the cards I have using the sheet in Tabletop Simulator:

https://imgur.com/a/wg5sM9k

If by some miracle people do find cards I've missed, I will add them to the game and update this list.