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A Mono-Green EDH deck based around Omnath, Locus of Mana Contains many Mana boosters and trample to make it effective
This deck has been viewed 3,016 times.
with as much ramp as you have, 40 lands is rather unnecessary. You could probably get away with 33-35 lands.
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Rofellos, Staff of Domination are illegal cards for EDH btw. You can only add cards of the color of your general, including multicoloured cards. So you have to replace some of the mutlicoloured ones. I'd add Harmonize and some creature tutors.
This is a good solid deck :) instead of one time spells that untap mana, go with something like Seedborn muse or Patron of the Orochi (or both) Also i don't see to many ways to give Omnath protection (hexproof) because it seems like he is your win condition, i would defiantly throw in some other cards with all the mana ramp, such as Genesis Wave.. I made an Omnath Deck, you should take a look, it might give you some ideas of what to do with all that mana lol http://www.mtgvault.com/ViewDeck.aspx?DeckID=294297