I like fire kings because your opponent has to use attacks to get rid of some of you high lvl monsters aka. fire king garunix and sacred phoenix of nephthys or they just come back next turn a do a lot of destruction. I also think hazy flame are a good choice to add in because hazy flame sphinx can summon a fire type monster if you get lucky and all the hazy flame monsters are fire.You can also add in the hazy flame xyz monster. fire fists already have a lot of extra deck cards to use.