What it does
"Increment" isn't an official Magic: The Gathering keyword or ability, so there's nothing standardized to explain. You may be thinking of a different term—possibly a card-specific mechanic, a piece of slang, or a misremembered keyword.
A few likely candidates: you might mean counters in general (which you "increment" by adding +1/+1 counters or charge counters), or "Proliferate," which lets you add another counter of each kind already present on permanents and players. Another possibility is "Amass," which increments an Army creature's size, or mechanics like Renown and Adapt that build up over time.
If you can tell me the exact card or context where you saw "increment," I can give you precise rules and Commander applications. Otherwise, let me know which counter-related mechanic you're after and I'll break it down.








