Each of your Crime Lords costs 1 less build counter to deploy.
As long as you have a Crime Lord in any arena, each of your opponent's units in the Ground and Character arena loses Stealth.
Keywords
Stealth
Stealth: An isolated, static ability that means, "This unit can't be attacked unless it's tapped or has damage counters on it." An untapped and undamaged unit with Stealth can still be affected by alternative types of damage. (Such as Overkill.) As long as the unit has any number of damage counters on it, it can't use Stealth.