What it does
I'm not aware of "Chaosbringer" as an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or any official keyword glossary that I can verify.
It's possible you're thinking of a card name, a creature type, or a custom/unofficial mechanic rather than a true keyword ability. For example, there are cards with "Chaos" themes (like older Planechase chaos effects tied to planar dice), but "Chaosbringer" itself isn't a recognized rules term.
If you can share the specific card or where you encountered this, I can give you accurate rules guidance. I'd rather flag the uncertainty than invent mechanics that could mislead you during a game—especially in Commander, where rules disputes across a four-player table get messy fast.
