When each turn starts, if you have 2 or more unique Assassins and/or Bounty Hunters in any arena, choose one: One of your units gets "Bounty: Gain 1 build point." until end of turn. Or: Put 1 captivity counter on a unit in any arena.
Keywords
Bounty
Bounty: [bonus]: A layered ability triggered during a unit discard that means, "When another unit is discarded by damage from this unit, you gain the following when your next build step starts." Bounty triggers even if the attacking unit leaves play. Bounty works in the build zone. You will gain the bounty even if the attacking unit is sent to the discard pile. The unit can't collect a bounty on itself.