interesting addition to the challenge, though your prolly gonna experience a mana issue with the lands you have. Either getting the ones you don't need or too much of a couple and not enough of the others. Look into Glimmervoid + Reflecting Pools or just RP.
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You should consider switching some lands out for "Cloudposts" (lands that give you a colorless mana per locus in play and Cloudpost is a locus) with 2 cloudpost out you can generate 4 colorless mana 3 - 9 mana 4 - 16 mana.
Another suggestion would be -Solar Blast (Onslaught) 3 colorless, Red: Deal 3 damage to creature or player. Cycle for 2 colorless, Red: deal 1 damage to creature or player anyway.
should look into "Rolling Thunder" (it's fireball's big brother)
You may want to add in a "Caged Sun" or 2 to double/tripple the ammount of mana you get from your plains and give your angles +1/+1 per Sun. Just a thought.
Check out my Cat deck (leonin). Very agressive, fast playing deck based on Leonin w/ equipment. http://www.mtgvault.com/ViewDeck.aspx?DeckID=212638
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