When your build step starts, if this unit doesn't have any damage counters on it, gain 1 build point.
Put 2 damage counters on one of your opponent's units in the Space arena. Play only if you have an Equipment attached to this unit.
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.