Found this info some ingenious person thought up regarding Disposable Fires: Especially when fighting a high level champion type, if your DIPPS (Diamond, Infinity, Passion, Pyramid, Soccer who have a 25% chance @ a critical hit when L14 or L15 against a L20 champion) or Metal (15% @ L14 or L15) are defeated & healing, OR if you don't have any of them, buy a Fire for coins (10 second incubation). A L1 Fire has the same 10% chance as ALL other dragons @ ANY level. Throw the L1 Fire into battle. If he is defeated, sell him as this saves on healing time. When the next battle comes around do the same thing. I have seen it work.