Create a PriorityClass with globalDefault true.

Every pod created afterwards with no priorityClassName inherits that priority, cluster-wide.

No pod create verb is needed.

The effect lands on other people's future workloads, not on one the attacker submits.

Existing pods keep the priority they were admitted with, so the change is invisible until the next rollout.

Only one PriorityClass may be the global default, so setting it also displaces whatever the platform team configured.