The Live Twins that were recently released may be somewhat underwhelming in the real game with at best being a mediocre rank-4 fiend engine, but when I had been thinking about it, if Knightmare Mermaid was still legal, they'd have truly shone. Because of this, I had to try them out in Traditional Format and they do indeed work amazing as a early play for turboing the Orcust combo, as well as help lead to really crazy combos.
Adding them to the typical Traditional Format Orcust deck gives them a bit of a boost to them, just watch out for hand traps of course. The Predaplant Engine can search out Dimension Fusion for even more explosive plays. Rarely are any of these cards dead in your hand, especially with some of the new Phantom Rage support.
Side deck is alternative options you can try.