"Mix Master: King of Cards" — No Such Official Game Exists

There is no officially released online game titled exactly “Mix Master: King of Cards.”

Likely Confusions

• Mix Master (Korean MMO / anime, 2005): Monster-taming MMORPG (later Mix Master: Final Force). Shut down globally ~2013. No “King of Cards” subtitle.
• King of Cards (slot game): Novomatic/Greentube slot machine — gambling, not TCG.
• Magic: The Gathering Arena / Hearthstone / Legends of Runeterra: Major digital CCGs — sometimes have “Master” or “King” ranks/events.
• Fan project / private server: “Mix Master” private servers exist; may have custom “King of Cards” mode.
• Mobile shovelware: Low-effort card battlers with similar keyword-stuffed names on Play Store/App Store.

To Identify Your Game

1. Platform? (Browser, mobile, PC, console)
2. Art style? (Anime, western, pixel, 3D)
3. Gameplay? (Auto-battle, turn-based TCG, real-time, gacha)
4. Year played?

With details, I can pinpoint the actual title.