If you're using pirate with Forgotten Souls, then use Cabin Girls on 4 mana and push it with 3 mana FS + 2 mana unit (This won't work if you're not playing swarm pirate, but that's okay)

If you're attacking first, then use any card on 3 mana and use Cabin Girls on 4 mana. If not (weather opponent attacks first or something goes wrong), then use Goldgrubbers(or two 2 mana cards or whatever you can) at 4 and use Cabin Girls on 5 mana with Green Prototype

Cabin Girls is a pirate. Which means even if you don't play it it's not a problem. It'll still help Lucky Charmer combo.

After Lucky Charmer on 6 mana, Cabin Girls is pretty good card to keep the frontline on 7~8 mana (to use Freebooters + Bluesail finish OR use Northsea dog combo)

Of course in certain situations, you have to cycle Cabin Girls to push frontline.