How to Play "Chaotic" Card Game? (Which One?)

"Chaotic card game" could be many things. Tell me:

• Exact name (Chaotic TCG? Chaos in the Old World? A house-rule game?)
• Rules source (link, booklet, memory).
• What makes it "chaotic"? Random events? Shifting rules? Hidden info? Simultaneous play?

With specifics, I'll explain the gameplay.