You know Zuberi Combustion COULD be a small bit of deliverance for the Priest against the new Warlock. Run in and smack her as hard as you can, put the burn token on, then use Combustion to get her again as a quick cast.
It's not perfect obviously, that's 5 mana for a 2 dice attack with no effects but still it's an option.
How can that ever be the choice over a regular attack spell?
This card seems a bit weak to me. I would have prefered if they listed the attack dice like they did with sleep cost for creatures with different levels in order to avoid a linear increase in the first levels.
Not regarding Flame +X on the target:
Its completely unacceptable to use this card when the target has 1 o 2 burns, simply because an attack spell does i better, provide an effect roll and leave the already stacked burns.
Imo its often a bad choice when the target has 3 burns, simply because 3 burns on a target is awesome. Why not spend 3 more mana and use a fireball for even more burns?
If the opponenet uses geyser all burns are gone, but he spend an action and 4 mana. If you remove them for him he saves mana and an action.
If your opponenent has initiative you can delay the fireball till he used his final quickcast on geyser to give the burns from fireball atleast 1 round of applying damage.
I believe most build planned around stacking burns will use the fire shaper ring, which means you get 1 more dice for the attackspells, where as this card does not benefit from said ring (like explode).
This will bring flameblast to 1 less dice when considering this spell if the target has 3 burns, but leave up to 4 burns on the target for the same cost.
With 4 burns stacked this spell start to have advantages flameblast and a fire shaped fireball.
I would have loved to see this card, perhaps even with a 1 to 1 ratio - burn to dice - instead as an enchantment. This would give the option to "counter" a geyser, renewing rain, priestess abilities and healing wand.