It's technically R/G/B as it has one multicolor dragon that also costs a death but that's what the transguild promenades and shimmering grotto is for.

Anyways, my deck is is attempting to get a wicked late game dragon setup while protecting myself and applying pressure with the mostly green creatures, especially beasts. I know I need some cards for my dragons, I just used the cards I currently have to set up a deck because I have several dragons. Any suggestions are more than welcome. Keep in mind it's a modern deck.

http://deckbox.org/sets/589017