What it does
I'm not aware of "Negative" as an official Magic: The Gathering keyword or ability. It's possible you're thinking of a different term, or this may be slang, a custom card, or a misremembered name.
A few things you might mean: negative loyalty counters on planeswalkers (you can't activate an ability that would take loyalty below zero), negative power creatures (a creature with power less than 0 deals no combat damage, and effects can lower power into the negatives), or perhaps "-1/-1" counters, which reduce toughness and kill creatures when toughness hits zero.
If you can clarify the exact card or context where you saw "Negative," I can give you a precise, accurate breakdown of how it works and where it matters in Commander. I'd rather not invent rules for a term that doesn't officially exist.
Iconic cards with Negative
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