Hey vivi, welcome to da forums. (you remember me from Kong, I hope)
Anyways, when you told me a few weeks ago about using a Fractal Phoenix, I thought about making a Fractal Phoenix myself. My "hypothetical version" used 6 cremations. 6 Cremations will work wonders in this deck, trust me.
I would take out maybe the 2 fire pendulums and a minor phoenix OR fahrenheit for a Cremation. This is assuming Mark of Fire, though.