Well, first of all, slow down. 2 polls and 0 comments may be overkill. Maybe Berzerker Rage is good, but I already like it the way it looks.
About balance, it could damage you to half your hp and consume all your fire quanta. I'm more concerned about Cremation abuse than Miracle. Using 2 of this in a turn is a 9x damage combo. If you upped the cost a little bit...
IDK what else to say, the only abuse I see is this+Dive+Sky Blitz and this+Cremation+this -again-.