i have not been playing for very long like some people, but i have built a pretty efficient eldrazi modern deck that i run on MTGO that is base green and runs multiple mystical elves, arbor elves, jorga treespeakers. these can produce alot of mana on their own but i also run two market festivals and awaking zones to help produce more mana. three ominamaths to keep the green mana in my mana pool to cast my eldrazi and i also splash for kruphix to keep mana and since he is indistructable he can hold mana better that ominamath also i run 4 eldrazi temples. i can see you have spells to find lands but i perfer to have more mana dorks because it seemes to allow me to cast my eldrazi faster.
just my opinion on how a deck like this could be played.