Don’t underestimate flexibility. The base mode is as close to a red Murder as we get, and will basically always have a good target. The top end is more powerful than any Fireball this format currently has access to. In any red deck that isn’t hyper-aggro, I want to be playing this.
Well, that might explain our difference in evaluating the card. I don't think Murder is good eough for C/Ube (especially at 360) and Fight with Fire seems like a very bad version of it (sorcery, doesn't kill creatures with more than 5 toughness).
Why do people like Fight with Fire (unless the purposely depowering their removal)? Both with or without kicker it seems bad...
Also Garna, the Bloodflame can be quite a blowout with even triggering. End of opponent's turn cast Garna. In your turn cast random five drop and you suddenly have around 8 extra power ready to attack on turn six.
With only ~35 cards in my cube that work with counters Revolutionary would too often be an 3/3 trample for 1GG, which is pretty bad. I rather play Trusted Forcemage in almost every deck (and I am not running that card either).