I did a little poking around.  Here are some cards I'd seriously consider finding/buying:  Bladewing the Risen (and Bladewing's Thrall), Dragon Broodmother, Dragon Mage, Dragon Roost, Dragonspeaker Shaman, Hunted Dragon, Karrthus, Tyrant of Jund, Rathi Dragon, Sarkhan Vol, Thunder Dragon, and Zirilan of the Claw.  I'd also seriously consider Krosan Drover, Elvish Piper, Kavu Lair, Brass Herald, Garruk's Packleader, Ancient Ziggurat, Thunderscape Familiar (which you have), Command Tower (in your Counterpunch deck), Darigaaz's Caldera, Cryptic Gateway, Door of Destinies, Konda's Banner, Mana Echoes, Riptide Replicator, Shared Animosity, Steely Resolve, and Urza's Incubator.


Sorry this post was so long, but I figured you could use it for reference.