What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Loud Ruckus." This doesn't appear to be an official MTG keyword, ability word, or recognized mechanic.
It's possible you're thinking of a specific card name, a custom/joke card, or a misremembered term. If you meant something else—like a real mechanic such as "Riot," "Rampage," or an ability word—let me know and I'll happily break it down for you, including its rules nuances and how it plays in Commander.
If "Loud Ruckus" is a card or homebrew mechanic from a specific source, share the exact text and I'll explain how it functions and where players tend to misread it.
