I've been working on a Rith list myself, and I was wondering, how has Koth of the Hammer been working out for you? It seems like he probably couldn't be used to his fullest potential in a deck like this, but I haven't tried running him in anything outside of mono R, so I was curious.
Most of the time he is just ramp, but I will hold a mountain back before a Jokulhaups etc. and I'll have a 4/4 one drop to start hitting into people. Slow but it is stax after all.
1x Alloy Myr
1x Avacyn's Pilgrim
1x Bloom Tender
1x Druid of the Anima
1x Elvish Archdruid
1x Fyndhorn Elder
1x Gemhide Sliver
1x Goblin Welder
1x Hero of Bladehold
1x Hokori, Dust Drinker
1x Joiner Adept
1x Knotvine Mystic
1x Llanowar Elves
1x Loxodon Gatekeeper
1x Magus of the Tabernacle
1x Palladium Myr
1x Priest of Titania
1x Quirion Elves
1x Rith, the Awakener
1x Spelltithe Enforcer
1x Urabrask the Hidden
1x World Queller
Instant (6)
1x Chaos Warp
1x Krosan Grip
1x Path to Exile
1x Return to Dust
1x Reverberate
1x Swords to Plowshares
Planeswalker (2)
1x Chandra, the Firebrand
1x Koth of the Hammer
1x Buried Ruin
1x City of Brass
1x Command Tower
1x Exotic Orchard
1x Flood Plain
1x Gavony Township
1x Jungle Shrine
1x Kessig Wolf Run
1x Raging Ravine
1x Rith's Grove
1x Rocky Tar Pit
1x Rootbound Crag
5x Snow-Covered Forest
5x Snow-Covered Mountain
5x Snow-Covered Plains
1x Spinerock Knoll
1x Stirring Wildwood
1x Temple of the False God
1x Vivid Crag
1x Vivid Grove
1x Vivid Meadow
Sorcery (8)
1x Armageddon
1x Catastrophe
1x Gamble
1x Jokulhaups
1x Reforge the Soul
1x Shattering Spree
1x Wake of Destruction
1x Wheel of Fortune
1x Boros Signet
1x Coalition Relic
1x Darksteel Ingot
1x Fellwar Stone
1x Gruul Signet
1x Jester's Cap
1x Obelisk of Naya
1x Scourglass
1x Scrabbling Claws
1x Selesnya Signet
1x Sisay's Ring
1x Sol Ring
1x Sword of Feast and Famine
1x Talisman of Impulse
1x Talisman of Unity
1x Thran Dynamo
1x Tigereye Cameo
1x Tormod's Crypt
1x Troll-Horn Cameo
1x Worn Powerstone
Enchantment (9)
1x Aura Shards
1x Awakening Zone
1x Doubling Season
1x Goblin Assault
1x Impending Disaster
1x Martyr's Bond
1x Parallel Lives
1x Smoke
1x Stranglehold
Need to obtain cards:
Lots of LD and MLD around here.