Interesting card. There aren't really any other cards like this in Elements: it's a one-hit aggressive spell. Kinda makes me think you've played Magic the Gathering... :3
Having read the other comments, it occurs to me this is actually very similar
in principle to Rage Potion.
Both can be used to kill opponents creatures.
Both can also be used to buff your attack.
They cost very similar amounts.
And both work well (for the purposes of buffing your attack) with high HP cards (so neither particularly in a mono-fire deck).
I do like the idea of it, but I think it has two main applications which have already had holes poked in them:
1 - CC
2 - Add damage
The problems are:
1 - Fire has plenty of CC already.
2 - Catapult does as good a job, + frozen/poisoned bonuses.
Also if you used this in an Earth combo, Basilisk Blood would be a lame way to add HP, because obviously you'd be stuck waiting 6 turns before using your Afterburn for it to attack.
On top of that, Earth/Fire is overplayed anyway
I still like it though. Inspires ideas like "Target Critter gets a new ability: Eat one of your own men, he gets +3/+3!" =)