I've been tweaking this deck for a couple weeks now and I'm finally reasonably happy with it. New Multani isn't the optimal commander for a strategy like this one, but it's a cool card I wanted to mess around with while hopefully staying a little under everyone's radar. The deck and strategy is nothing overly fancy - play lands and resolve triggers for fun and profit. The nice thing about Multani is that he doesn't really care if there's an Armageddon cast. It's sort of a bummer to not have access to stuff like Knight of the Reliquary and The Gitrog Monster, but the deck is still capable of spiraling out of control pretty quickly.

Commander:
Multani, Yavimaya's Avatar

Creatures:
Sylvan Safekeeper
Sakura-Tribe Elder
Scavenging Ooze
Eternal Witness
Tireless Tracker
Courser of Kruphix
Ramunap Excavator
Undergrowth Champion
Tilling Treefolk
Azusa, Lost but Seeking
Oracle of Mul Daya
Centaur Vinecrasher
World Shaper
Titania, Protector of Argoth
Acidic Slime
Rampaging Baloths
Greenwarden of Murasa
Ulvenwald Hydra
Realm Seekers
Avenger of Zendikar
World Breaker
Terastodon

Instants:
Crop Rotation
Deglamer
Constant Mists
Beast Within
Krosan Grip
Realms Uncharted
Ambuscade
Harrow

Sorcery:
Green Sun's Zenith
Hurricane
Nature's Lore
Life from the Loam
Sylvan Scrying
Nissa'a Pilgrimage
Kodama's Reach
Skyshroud Claim
Harmonize
Tempt with Discovery
Primal Command
Rude Awakening
Rishkar's Expertise
Verdant Confluence
Boundless Realms

Artifacts:
Zuran Orb
Sol Ring
Lightning Greaves
Horn of Greed
Crucible of Worlds
Seer's Sundial

Enchantments:
Burgeoning
Sylvan Library
Song of the Dryads
Abundance
Zendikar's Roil
Doubling Season

Planeswalkers:
Garruk Wildspeaker
Nissa, Vital Force

Lands:
Evolving Wilds
Terramorphic Expanse
Blighted Woodland
Field of Ruin
Yavimaya Hollow
Rogue's Passage
Homeward Path
Mosswort Bridge
Tranquil Thicket
Slippery Karst
Desert of the Indomitable
Dryad Arbor
Winding Canyons
Petrified Field
Khalni Garden
Arena
Blasted Landscape
Oran-Reif, the Vastwood
Maze of Ith
21 Forest

I'm still tweaking the utility land suite - stuff like Dust Bowl and Glacial Chasm might make their way in here.