Would like to find more ways to protect/get Omnath through, control cards, and techy creatures. Any thoughts are appreciated. Very, very rough list. Don't want cradle was in here but I rarely have enough creatures out to warrant using it.
Vernal equinox might be right up your alley. It provides some protection in case your Omnath gets blown away, although it does help out everyone. Gemstone array can also store up mana if you need it, but I guess it's not so efficient.
1x Omnath, Locus of Mana
Lands: 38
1x Dustbowl
1x Maze of Ith
1x Scrying Sheets
1x Strip Mine
1x Tectonic Edge
1x Wasteland
1x Winding Canyon
1x Yavimaya Hollow
30x Snow-Covered Forest
Control: 12
1x Acidic Slime
1x All is Dust
1x Desert Twister
1x Indrik Stomphollower
1x Krosan Grip
1x Lignify
1x Nevinyrral's Disk
1x Oblvivion Stone
1x Plow Under
1x Rootgrapple
1x Terrastodon
1x Woodfall Primus
Mana: 15
1x Cultivate
1x Doubling Cube
1x Extraplanar Lens
1x Gauntlet of Power
1x Into the north
1x Kodama's Reach
1x Mana Reflection
1x Mwonvuli Acid-moss
1x Nature's Lore
1x Rampant Growth
1x Reap and Sow
1x Rofellos, Llanowar Emissary
1x Sakura-Tribe Elder
1x Solemn Simulacrum
1x Wood Elves
1x Akroma's Memorial
1x Asceticism
1x Canopy Cover
1x Eternal Witness
1x Lightning Greaves
1x Loxodon Warhammer
1x Nim Deathmantle
1x Pelakka Wurm
1x Rancor
1x Reclaim
1x Regrowth
1x Restock
1x Revive
1x Seedborn Muse
1x Vedalken Orrery
1x Whispersilk Cloak
Tutors/Draw: 14
1x Chord of Calling
1x Defense of the Heart
1x Greater Good
1x Harmonize
1x Mirri's Guile
1x Momentous Fall
1x Natural Order
1x Scroll Rack
1x Sensei's Divining Top
1x Soul's Majesty
1x Summoner's Pact
1x Sylvan Library
1x Tooth and Nail
1x Worldy Tutor
1x Ant-Queen
1x Gelatinous Genesis
1x Kamahl, Fist of Krosa
1x Wurmcalling
Rootgrapple and lignify for some targeted removal/control. Brittle effigy works too.
Deadwood treefolk provides more creature recursion. Patron of the orochi can help make Omnath ridiculously huge. Oracle of mul daya can also help get lands out.
How about asceticism? Trollshroud for all and regeneration if you need it. Any of the sword of x and y equipments also are good for protection.
Nim deathmantle could potentially be useful, both as a way to get Omnath through and to recur it immediately.
Oran-rief, the vastwood can probably replace one of your forests. It could be useful if you ever have to fall back on token swarms to win.
I should also mention predator, flagship as a way of making your Omnath fly and as a (very expensive) removal device.