The theory here is to periodically clear the board.  Use your Bloodfire Dwarfs against the early threats, and big white spells after your opponent has spent their hand.  Top-decking is your friend, but save a haste creature or two for a quick swing after the field is empty again.  Captains' Maneuver, Orim's Thunder, and Divine Light are great in one-on-one matchups after a cleared field.  Use them to keep your creatures from dying by reflecting damage back at an opponent or other creature.  Don't be afraid to take damage in the early game from Breath of Darigaaz or Sulfuric Vortex, but don't get carried away.  Pump Chimeric Mass for a creature the creature-killers ignore, use Squee's Embrace on anything you want to save the cataclysm, and judicious use of Synod Sanctum will give you the edge when your opponent stands defenseless.  Keep your Second Sunrise for Devastating Summons (Remember to tap your lands before you sac them!) or, if you can afford it, Hellion Eruption.