What it does
I'm not aware of "Paradigm" as an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or on any printed cards that I can verify.
It's possible you're thinking of a specific card name (some cards use "paradigm" as flavor text or in their title), a homebrew/custom mechanic, or a term from a non-official format. There's also a chance it's a misremembering of a real keyword like "Paradox" interactions or something from a specific set's mechanic.
If you can tell me which card or context you saw "Paradigm" in, I can give you an accurate rules breakdown and explain how it plays in Commander. I'd rather not invent rules for a mechanic I can't confirm exists, since that could lead you astray during games.
Iconic cards with Paradigm
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