They can easily make a good pendulum deck of they wanted to like with SHS and melodious. The secret it just giving them such a good pendulum effect that they also function as a good continuous spell card.
Look at this thing godamn thing for example:
>it's an archetypal ancient gear box
>pendulum effect can search S/T
>it has an effect that triggers while in the extra so it can go back to being a scale, so it can search again