This deck won 7/10 duels against Ai3
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Here, your supposed to play Ash Eater (or Brimstone Eater if playing upped), Immolate it, and start playing Fire Spirit and Lava Golem to start growing, Deflaging/Fire bolting dangers.
EDIT: Ralouf1's suggustion gave me the idea for this deck, even though I haven't tested it yet, it should do okay.
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Here you have 2 quanta Pheonixes, that can be immolated once a turn, crimson dragons for the extra fire quanta, and Lava golems for the beat sticks. Will edit when I can get decent stats, let me know how these decks do, and sguggestions are always appreciated