I like to put 17 elemental heros on the deck (including one Blazeman, Woodsman, Ocean, Clayman, Heat and whatever you want), three fusion cards. Maybe change some cards for two H - Heat Heart.
And I put in special deck just a Trinity (but you can use other fusions too). Use the hability Fusion Time (I think that it is the original name, on my phone it is "Hora da Fusão").
The fact the third-best card in the deck (after Blazeman and Fusion Recovery) is a toss-up between A Hero Emerges and Elemental HERO Heat is all you really need to point out to prove this structure deck is pretty bad. If you get the deck, it's basically just going to be for Blazeman. Cards like Flash and Lady Heat are just plain garbage.