You should check
this thread for some help on how to build a competitive sligh deck. They seem to have quite some success with it.
More specifically on your deck:
4 Blistering Firecat and 4 Ball Lightning are not very good. They are expensive (from the T1 point of few) and are killed by Darkblast ( a new card from Ravnica thats bound to see some amount of play). On turn 3 you're better of dropping Blood Moon, seeing as a 4-5cc gifts decks are getting more popular (see MDGoat/Oath Gifts).
Like yespuhyren said, the Spark Elemental should really be Lightning Bolt. I know Spark Elemental combos with Skullclamp, just like Ball Lightning and the Firecat, but really, you won't win the cardadvatage war against any serious deck. Burn is not only better against creatures, it also gives you direct reach. Spark Elemental will die to Triskelion or can be blocked. Lightning Bolt doesn't have that problem (though it can be 'counterd' by Misdirection).
I like the whole deck idea of combining 1 toughness creatures with Clamp, and lost of cheap artifacts with Atog, but I'm afraid T1 is too fast and powerfull for this to work. You shouldn't drop all of the artifacts immediately, since both Pithing Needle and Chalice can be quite powerfull, you just need to play more card that are good on their own.
