well nephthys is very flexible, it can be used as a pure nephthys deck, with yubel or with AG reactor dragon/geartown combo, no one knows what's the optimal build yet.
laval is good but it heavily focus on dustflame blast, after all the card is a game changer, the deck is slower than nephthys tho.
no one seems to care much about fire fist, after all it's very expensive to build an optimal deck.