What it does
I'm not familiar with "Lord of Chaos" as an official Magic: The Gathering keyword or ability. It's possible you're thinking of a specific card name rather than a keyword—there have been cards with chaos-themed names, and some products (like the Planechase supplement) use chaos mechanics tied to the planar die.
If you meant the chaos ability from Planechase: when you roll the planar die and get the chaos symbol, you trigger the "Chaos Ensues" ability printed on the active plane card. People often forget you can roll the die only during your main phase with an empty stack, and that rolling costs an escalating amount of generic mana after the first free roll each turn.
If you can share the exact card or mechanic you're asking about, I'll give you a precise rundown of how it works and why it matters in Commander.
Iconic cards with Lord of Chaos
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