There's not really much of any muscle, but the field spell alleviates this by lengthening the amount of time it takes to destroy you by halving all battle and effect damage.
It seems like the real 'muscle' is setting all of their cards, attacking with all of your Ghostricks (including 1 Stein) to search for Ghostrick Panic. Set Panic and all of your Ghostricks, then when your opponent does something, activate Panic. If your opponent flips anything after Panic, Witch flips them back face-down so you can start it all over.
The more I look into it, the more I see the archetype as something fun--but they're not going to be doing anything great with what they have now. Ghostrick House is sort of like Dracossack--it's going to see more use outside of the deck it was intended to be used in, and that's the downfall of the Ghostricks.