Though this decks looks pretty fearsome, and hard to beat, I actually don't get the thought behind you mark-choice. The main advantage of the mark over a regular pillar, is it's availability: It will produce Quanta from the very first turn on. The faster you get the FFQs out and working, the more damage you will do and (!) the more fire Quanta you will gain.
Once you get 2 or three FFQs producing fireflies for some turns, fire Quanta won't be a problem anymore. With this in mind, you may be better off using a mark of air.
Beside that, the deck looks great!
edit: Just thought about it again: Without the fire-mark, an early Otyugh, Ulitharid, or any other creature control could shut the deck down. Just scratch, what i wrote above. Great deck!