Mighty as Fire Can be used after your Life Points are at 3000 or below. Play the Field Spell "Molten Destruction." If there already is Field Spell on your side of the Field, return it to your hand. This skill can only be used once per Duel.
I have a deck that's a mix of E.HERO Terra Firma and E.HERO Inferno. Heat+lady head with Woodsman/Ocean end up vibing great! I have a couple of phantom magicians in there as well to get Woodsman on the field sooner and get a poly. I was going for a more Manga feel for the deck and this flows nicely!