Not sure if there is any chance at 4 mana but is there any utility to the fact that its a bigger pyromancer that makes flyers off more cards and has a sac for mana outlet. If Mentor was not restricted I would not even post this but it feels like if you wanted your Jeskai list to have 6 pyromancer effects this could be ok.
Maybe there is some chain of cards you can play and sac over and over again to make this a combo piece. You can endlessly loop Tops with it :p.