Other good cards that could help if you're interested.-Comet Storm, since it does cost one more then fireball, but you can cast it as an instant which is nice.-Valakut, the Molten Pinnacle, which I feel should be in any burn deck.-Magma Jet, 2 mana for 2 damage, but allows you to Scry 2, which I think is great for a Mono Red.
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I always liked the modular creatures, thumbs up for the concept of your deck. I assume putting counters on the Darksteel Reactor is your win condition?
Reverberate could help you. It costs 2 red mana, and it allows you to copy target instant or sorcery and choose a new target for the copy. You could use it to double cast one of your spells, or use it to copy a counterspell played on you, then target their counter with your copy.I like it though, makes me want to build a goblin deck, lol.