Rampage is a keyword ability.
Amy attacks with a Wolverine Pack, which has rampage 2, and Neil blocks it with two Grizzly Bears. After Neil declares the block, rampage will trigger and give the Wolverine Pack +2/+2, as it is being blocked by one additional creature.
- 702.22a. Rampage is a triggered ability. "Rampage N" means "Whenever this creature becomes blocked, it gets +N/+N until end of turn for each creature blocking it beyond the first."
- 702.22b. The rampage bonus is calculated only once per combat, when the triggered ability resolves. Adding or removing blockers later in combat won't change the bonus.
- 702.22c. If a creature has multiple instances of rampage, each triggers separately.