Firebomb Infiltrator

Put firebombs and scorpions in your opponent's deck, then make them draw them with nightfall, fanatic, and teacher (the weights are nasty with the destiny spells you're putting in their deck). Kerasaur turns the firebombs and scorpions into extra draws for you, and makes your spells make them draw more, which is more bombs and scorpions. Market for gunsmith or the yeti to get infiltrates through in the late game.

This deck is definitely not worth crafting 4 light the fuse, but at the same time it's by far the most competitive firebomb deck I've built.