Huh, silly fist of suns. Only thing I would suggest is finding more ways to get it, maybe by splashing blue for card draw and fabricate.
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Lightning bolt does have limited power, but I don't feel like flame slash has that much more power and you sacrifice a lot of versatility. Think the 4 x narcolepsy in the sideboard can deal with baneslayers or obliterators for me?
Check out Kavu Lair or Garruk's packleader. Probably better for your purposes than soul's majesty.
Fling is there for a little extra kick. After you get an attack in the Jor Kadeen, you should be withing fling range (8 damage), and for two mana you can play it after a relentless invasion. I would also like to have arid mesa's, but I'm being budget conscious. Tempered steel could be good... I still think I'd rather play fling over assault strobe and keep the element of surprise. Hmm, artifact counters. Into the core, manic vandal, shatter, crush?
Look at the Viscera Seer, Perilous Myr, Glissa combo. Pretty strong if you can assemble. Glissa also requires creatures to kill in order to trigger her ability. Beast within is a good way to do that. Also need a way to sac artifacts in order to make glissa's ability useful. Try barrage ogre.