This list looks quite solid to start with. I would suggest some few changes, though:
1. I would add some more lands (but still keeping the list 60 cards). 22-23 lands should be fine, looking at your mana curve. Otherwise you could add cards like
Skull Prophet to
accelerate your mana (it also is a decent hitter and fills your graveyard if needed).
2. If you have cards available I would try to get some more cards for 3 mana in. The overflow of 2 mana cards is a little to much (I would say).
3. (not necessary) Switch
Naturalize with
Return to Nature which gives you one more way to use it by attacking the opponents graveyard.