Deploy only while you control a Mech in your berth.
Deal 2 damage to each of your opponent's crew in one battle.
Explained
Deploy only while you control a Mech in your berth.306.6
A condition, not a cost: nothing is exhausted. When you deploy it you need a Mech on board that isn't dispatched, ready or exhausted, new ones too. A crew of yours in a battle doesn't count (306.6).
Deal 2 damage to each of your opponent's crew in one battle.705.7, 801.9a
After dispatch, choose the mothership battle or an expedition where your opponent has crew. Each of their crew there takes 2 damage; your own crew there don't. Plating takes it first, damage to hull stays, and a crew left with no hull is destroyed at once (705.7).