Does rampage apply for each blocker beyond the first or only once per combat?

Rampage is a triggered ability that gives the attacking creature a power and toughness bonus based on how many creatures are blocking it beyond the first. The bonus applies for each blocker past the first, not just once total (CR 702.23).

Specifically, CR 702.23b states that when a creature with rampage N becomes blocked, it gets +N/+N for each creature blocking it beyond the first. So if two extra blockers are assigned, the rampage triggers and counts both, resulting in a total bonus of +2N/+2N (once for each of the two extra blockers).

It is important to note that rampage triggers when the creature becomes blocked, and the bonus is calculated based on the total number of blockers minus one. The ability checks the final number of blockers assigned, so the bonus is applied in a single lump at the appropriate time rather than triggering separately for each extra blocker.

Concrete example: You attack with a Erhnam Djinn variant that has Rampage 2. Your opponent blocks it with three creatures. There are two blockers beyond the first, so the creature gets +2/+2 for each of those two extra blockers — a total of +4/+4 for that combat.

Rampage only applies to the attacking creature and only during the combat in which it becomes blocked; the bonus wears off at end of combat when the ability's effect ends (CR 702.23b).