What it does
I'm not aware of "Body-print" as an official Magic: The Gathering keyword or ability. It doesn't appear in any released set or in the comprehensive rules, so I can't accurately explain its function, rules nuances, or Commander relevance.
It's possible you're thinking of a different term, a misspelling, or perhaps a custom/unofficial card from outside official Magic. A few similar-sounding mechanics you might mean: Imprint (an ability where a card is exiled and referenced for an ongoing effect, like Isochron Scepter), or Blueprint-style proxy effects from joke or playtest cards.
If you can point me to the specific card or set "Body-print" comes from, I'm happy to break it down properly. I'd rather admit uncertainty than invent rules that could mislead your gameplay.
Iconic cards with Body-print
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