Rampage
From M:TG Archive, a library of Magic: The Gathering information
Rampage is an obsolete keyword ability, mainly in red and green creatures.
"Rampage N" means "Whenever this creature becomes blocked, it gets +N/+N until end of turn for each creature blocking it beyond the first." Rampage is calculated only once per combat. Adding or removing blockers doesn't change the bonus.
Each instance of rampage on the same creature triggers separately.