What it does
I don't have a Magic: The Gathering keyword or ability called "Rogue Trader" in my knowledge. It doesn't correspond to any official keyword (like Flying, Deathtouch, or Convoke) or named ability word in the game.
There is a Warhammer 40,000 setting called "Rogue Trader," and Magic has released Universes Beyond Warhammer 40,000 Commander decks—but "Rogue Trader" isn't a mechanic from those products either. It's possible you're thinking of a specific card name, a creature type, or a mechanic from another game entirely.
If you can tell me the exact card or where you saw the term, I can help clarify. Otherwise, double-check the spelling or the source—I don't want to invent rules that don't exist and mislead you at the table.
Iconic cards with Rogue Trader
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