This is one massively over-costed creature right here.The firebreathing effect on it is nice, but it's not worth paying 4 mana for a 1/1 flying bug. What other 1/1 fliers exist out there for cheaper and are better? Aven Squire has exalted for 2 mana, Beacon Hawk has defensive firebreathing for 2 mana, Defiant Falcon looks for better rebels for 2 mana, and finally Erayo, Soratami Ascendant is just awesome and also for 2 mana. So, unless you have something to make creature spells cheaper (like Planar Gate, Cloud Key, or Urza's Incubator), this just isn't worth it.
Pros: Firebreathing's always nice
Cons: Overcosted for its abilities
Replacements: Almost any flier for 2 mana