What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Chainsword." This doesn't appear to be an official MTG keyword or mechanic that I can accurately describe.
It's possible you're thinking of an Equipment card (the Warhammer 40,000 Commander sets do include thematic weapons), a card name, or a mechanic from a different game. Note that "Chainsword" is a signature weapon in the Warhammer 40K universe, so it may be the name of a specific card rather than a keyword ability.
If you can share the exact card name or where you encountered this term, I can help explain how it actually works. I'd rather not invent rules text and risk teaching you something incorrect that could cost you a game.
Iconic cards with Chainsword
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