yeah blood the bomb is extremely similar to tornado, but it doesn't require something else to make it (unless you count blacksmith, but you don't actually NEED it to make the bombs).
6x15=90 uncopyable damage that can be blocked by shields, you're going to want death instead of aether
if you want it to deal damage when it dies, then best idea is probably to make it have 0/2, and deal either one or two damage to all creatures (or just enemies? i'm thinking chains). and 5-10 to the player.
i just thought sparks were interesting but not really strong enough to make a deck based on... (hurries off to trainer)