Alternately, Voltaic Construct, Palladium Myr, Myr Galvanizer, and, say, Iron Myr. Tap Palladium and Iron for three mana, use one for Myr Galvanizer, untapping all but itself. 2 mana floats. Tap again for 3 additional mana (say 3 colorless and 2 red in the mana pool). Use Voltaic Construct's ability to untap Galvanizer (1 colorless and 2 red remain). Repeat process indefinitely.
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This is one of the fastest decks I've ever seen. You should consider sideboarding Tarmod's Crypt, and most likely running four Lodestone Golems (to make it harder for others to cast spells).