Exert

Click here for visual deck (with images)
Click here for my EDH Commander decks
 
Exert doesn't actually tap the creature when used, so if you add Vigilance to all your creatures, Exert is pretty much free.
So the Johan general is pretty nice for the vigilance.
• Extra attack steps
• Other creatures that don't untap as normal (not really a drawback in this deck, as they don't tap to attack)
 
Mana Acceleration (13): General (1): Spells (12): Sideboard (Omitted/Cut card ideas):
1 Arcane Signet 1 Johan 1 Lifecrafter's Bestiary 1 Phyrexian Colossus
1 Boros Locket   1 Aura Shards 1 Spectral Force
1 Gilded Lotus Creatures (38): 1 Waves of Aggression 1 Apes of Rath
1 Gruul Locket 1 Altar Golem 1 Beastmaster Ascension 1 Garruk's Packleader
1 Selesnya Locket 1 Mage-Ring Responder 1 Elemental Bond 1 Flameshadow Conjuring
1 The Immortal Sun 1 Colossus of Sardia 1 Lurking Predators 1 Minion Reflector
1 Unstable Obelisk 1 Traxos, Scourge of Kroog 1 Aggravated Assault 1 Kiki-Jiki, Mirror Breaker
1 Mirari's Wake 1 Ahn-Crop Champion 1 Fury of the Horde 1 Beastmaster Ascension
1 Hope Tender 1 Aurelia, the Warleader 1 Relentless Assault 1 Seedborn Muse
1 Mana Reflection 1 Resolute Survivors 1 Savage Beating 1 To Arms!
1 Nissa, Genesis Mage 1 Bitterblade Warrior 1 World at War 1 Quest for Renewal
1 Oasis Ritualist 1 Champion of Rhonas 1 Cathars' Crusade 1 Gideon, Martial Paragon
1 Zendikar Resurgent 1 Hooded Brawler   1 Reveille Squad
  1 Pride Sovereign   1 Samut, Voice of Dissent
Lands (36): 1 Primordial Sage   1 Curse of Bounty
1 Taiga 1 Rhonas's Stalwart   1 Sword of the Paruns
1 Savannah 1 Soul of the Harvest   1 Paradox Engine
1 Plateau 1 Watchful Naga   1 Brave the Sands
1 Boros Garrison 1 Ahn-Crop Crasher   1 Heliod, God of the Sun
1 Gruul Turf 1 Battlefield Scavenger   1 Angelic Skirmisher
1 Selesnya Sanctuary 1 Combat Celebrant   1 Serra's Blessing
1 Jungle Shrine 1 Deep-Slumber Titan   1 Always Watching
1 Akoum Warrior // Akoum Teeth 1 Emberhorn Minotaur   1 Akroma's Memorial
1 Bala Ged Recovery // Bala Ged Sanctuary 1 Fervent Paincaster    
1 Command Tower 1 Glorybringer    
1 Emeria's Call // Emeria, Shattered Skyclave 1 Hellkite Charger    
1 Flamekin Village 1 Khenra Scrapper    
1 Gaea's Cradle 1 Moraug, Fury of Akoum    
1 Hanweir Battlements 1 Nef-Crop Entangler    
1 Kabira Takedown // Kabira Plateau 1 Port Razer    
1 Kazandu Mammoth // Kazandu Valley 1 Scourge of the Throne    
1 Kazuul's Fury // Kazuul's Cliffs 1 Trueheart Twins    
1 Khalni Ambush // Khalni Territory 1 Angel of Condemnation    
1 Makindi Stampede // Makindi Mesas 1 Devoted Crop-Mate    
1 Mosswort Bridge 1 Glory-Bound Initiate    
1 Ondu Inversion // Ondu Skyruins 1 Gust Walker    
1 Path of Ancestry 1 Oketra's Avenger    
1 Reflecting Pool 1 Rhet-Crop Spearmaster    
1 Sejiri Shelter // Sejiri Glacier 1 Steward of Solidarity    
1 Shatterskull Smashing // Shatterskull, the Hammer Pass 1 Tah-Crop Elite    
1 Skyclave Cleric // Skyclave Basilica 1 Vizier of the True    
1 Slayers' Stronghold      
1 Song-Mad Treachery // Song-Mad Ruins      
1 Spikefield Hazard // Spikefield Cave      
1 Spinerock Knoll      
1 Tangled Florahedron // Tangled Vale      
1 Turntimber Symbiosis // Turntimber, Serpentine Wood      
1 Valakut Awakening // Valakut Stoneforge      
1 Vastwood Fortification // Vastwood Thicket      
1 Windbrisk Heights      
1 Sol Ring