Why on earth would you have Grim Lavamancer running in a deck that wants cards to stay in your graveyard? Green Sun's Zenith should be a 2-of, no more than that. A good base, but needs some work. Consider U/G rather than R/G, as blue has more options to fill your own graveyard, which is what you are looking for here.
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Hymns are great, and cheaper (though BB is roughly equivalent to 2B in most decks, with mono-black it's quicker), you're right. I'll have to look into that, thanks :)