I don't think you need as many Green sources. If you can, get yourself some of the Shocklands that came out in RtR, like Overgrown Tomb and Blood Crypt. They work playing with Taplands (like Rb Crag and Dskull Summit). You might want to play Dragonspeaker Shaman to reduce your costs, and Urza's Incubator. I also prefer Balefire Dragon to Ryusei. Rampant Growth should be Farseek, and Exploding Borders should be Ranger's Path (especially for Shocklands). I'm not a fan of Birds, just because...eh. You also should get rid of Bower Passage, as it's terrible. You probably could make do with just 3 Thundermaw Hellkite and add a second Utvara. I like Furnace Whelp for mid-game board presence. And it's a place to sink excess Red if you can't cast anything. You might also want to look into running a single Dragonstorm for when your need to find a specific Dragon. You also NEED Broodmate dragon.
Now, if you're insistent on running this as Jund (BRG) then again, you should look into the cards I mentioned above, and dragons with Haste. Karrthus, Tyrant of Jund, Archwing Dragon, Hellkite Charger...even Hellkite Overlord as a bomb. All of them work VERY well with Utvara Hellkite, since then you're just pumping out dragons. And Bladewing the Risen is a great way to get your dragons back. If those don't work for you, think about adding Fires of Yavimaya to give your creatures Haste.