This is my Omnath deck that is one of the 2 decks I have been playing to win the most recent season of the EDH league that I play in at Armada Games. I'm sure a decent number of people read Sheldon Menery's EDH articles on Star City each week and if you've seen him mention playing against David with Omnath that would be me and this deck. I'll post my other deck, Niv-Mizzet, that I alternated each week with in another thread. I listed this as casual cause the Armada league tends to run towards games that are very interactive and take a while and hopefully as little combo-ish as possible.
1 Omnath, Locus of Mana
Colorless Creatures
1 Kozilek, Butcher of Truth
1 Ulamog, the Infinite Gyre
Green Creatures
1 Sakura-Tribe Elder
1 Rofellos, Llanowar Emissary
1 Eternal Witness
1 Yavimaya Elder
1 Mold Shambler
1 Oracle of Mul Daya
1 Wickerbough Elder
1 Genesis
1 Acidic Slime
1 Ant Queen
1 Arashi, the Sky Asunder
1 Seedborn Muse
1 Kamahl, Fist of Krosa
1 Primeval Titan
1 Terra Stomper
1 Vigor
1 Cloudthresher
1 Gaea's Revenge
1 Spearbreaker Behemoth
1 Regal Force
1 Terastodon
1 Woodfall Primus
1 Solemn Simulacrum
1 Duplicant
Green Spells
1 Worldly Tutor
1 Nature's Lore
1 Three Visits
1 Kodama's Reach
1 Krosan Grip
1 Skyshroud Claim
1 Creeping Mold
1 Harmonize
1 Natural Order
1 Desert Twister
1 Summoning Trap
1 Tooth and Nail
1 Praetor's Counsel
1 Chord of Calling
1 Genesis Wave
Green Enchantments
1 Mirri's Guile
1 Survival of the Fittest
1 Sylvan Library
1 Defense of the Heart
1 Greater Good
1 Asceticism
1 Lurking Predators
1 Mana Reflection
1 Mana Vault
1 Sensei's Divining Top
1 Sol Ring
1 Emerald Medallion
1 Grim Monolith
1 Lightning Greaves
1 Darksteel Plate
1 Oblivion Stone
1 Helm of Possession
1 Nevinyrral's Disk
1 Vedalken Orrery
1 Mind's Eye
1 Spine of Ish Sah
My other decks
Niv-Mizzet, the Firemind
Zur the Enchanter