Chorus of the Conclave

Click here for visual deck (with images)
Click here for my EDH Commander decks
 
Ramp up a ton of mana.
Lots of creatures that use +1/+1 counters for things.
There is a modular mechanic subtheme; it's amusing but not 100% necessary.
 
Mana Acceleration (20): General (1): Spells (8): Sideboard (Omitted/Cut card ideas):
1 Caged Sun 1 Chorus of the Conclave 1 Sword of Feast and Famine 1 Rishkar, Peema Renegade
1 Doubling Cube   1 Ajani, Valiant Protector 1 Arcbound Fiend
1 Extraplanar Lens Creatures (35): 1 Aura Shards 1 Arcbound Bruiser
1 Gauntlet of Power 1 Arcbound Crusher 1 Bear Umbra 1 Arcbound Hybrid
1 Planar Gate 1 Arcbound Lancer 1 Death's Presence 1 Magus of the Candelabra
1 Semblance Anvil 1 Arcbound Overseer 1 Doubling Season 1 Primal Vigor
1 Karametra, God of Harvests 1 Arcbound Ravager 1 Greater Good 1 Solidarity of Heroes
1 Mirari's Wake 1 Arcbound Reclaimer 1 Nature's Will 1 Soul's Majesty
1 Boundless Realms 1 Arcbound Slith   1 Keeper of Progenitus
1 Gyre Sage 1 Arcbound Stinger   1 Momentous Fall
1 Mana Reflection 1 Arcbound Worker   1 Gleam of Authority
1 Nissa, Worldwaker 1 Crystalline Crawler   1 Citadel Siege
1 Regal Behemoth 1 Etched Oracle   1 Ajani, Mentor of Heroes
1 Selvala, Heart of the Wilds 1 Hangarback Walker   1 Temporal Aperture
1 Skyshroud Claim 1 Mindless Automaton   1 Candelabra of Tawnos
1 Traverse the Outlands 1 Tetravus   1 True Conviction
1 Vernal Bloom 1 Thopter Squadron   1 Staff of Domination
1 Viridian Joiner 1 Triskelavus   1 Tempt with Glory
1 Vorinclex, Voice of Hunger 1 Triskelion   1 Gilded Lotus
1 Zendikar Resurgent 1 Walking Ballista   1 Sporeback Troll
  1 Workhorse   1 Ulamog, the Infinite Gyre
Lands (36): 1 Enduring Scalelord   1 Ooze Flux
1 Savannah 1 Bloodspore Thrinax   1 Earthcraft
1 Temple Garden 1 Champion of Lambholt   1 Land Tax
1 Canopy Vista 1 Cultivator of Blades   1 Mycosynth Golem
1 Windswept Heath 1 Fertilid   1 Oblivion Stone
1 Grasslands 1 Fungal Behemoth   1 Crowned Ceratok
1 Gaea's Cradle 1 Kalonian Hydra   1 Omnath, Locus of Mana
1 Krosan Verge 1 Mycoloth   1 Birds of Paradise
1 Myriad Landscape 1 Patron of the Orochi   1 Collective Voyage
1 Mosswort Bridge 1 Renegade Krasis   1 Overwhelming Stampede
1 Thawing Glaciers 1 Servant of the Scale   1 Idyllic Tutor
1 Windbrisk Heights 1 Vastwood Hydra   1 Academy Rector
1 Gavony Township 1 Vigor   1 Soul's Might
1 Mox Opal 1 Kinsbaile Borderguard   1 Enlightened Tutor
19 Forest 1 Mikaeus, the Lunarch   1 Sculpting Steel
2 Plains 1 Shinewend   1 Sterling Grove
1 Sol Ring 1 Twilight Drover   1 Planar Portal
1 Mana Crypt     1 Genesis Wave