consider terrastomper as SB material at least, also joraga treespeaker is awsome mana excelleration. help get that gaea's revenge out earlier.
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also a hard counter in deprive or maybe cancel would serve you better than mana leak, which is usually worthless late game.
should run 4 path and 4 oblivion ring, yeah they do rotate in Oct, but thats still a ways away, use the advantages of you colors and go with the best.
Beyond switching the refuges to glacial fortresses the rest looks solid. though i would probably run path or swords over the charm and negate over the esscence scatters. a DoJ or WoG really sucks when your opp has the mana to counter the mana leak. it also looks like you could have some amusment in taking out the steel of godhead and going into a local standard FNM.
Sorry, but it looks like you only put in red for bursts and the charger. Doesn't look stable enough for anything beyond a fun casual deck. and you really don't need the valakuts. put in crags and ravines if you want to keep going R/G. maybe even toss in some Banefires for elf-ball shenanigans.