Mairsil

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Click here for my EDH Commander decks
 
Creatures and Artifacts with activated abilities for the general to use
Untap self abilities (like Horseshoe Crab), again for the general to use. Cards that refer to themself do work properly with Mairsil (the name gets replaced with "Mairsil").
Clones act as extra ETB effects for Mairsil (you clone the general and just let the clone die)
Sakashima and Quicksilver Elemental are basically more copies of the general
 
Mana Acceleration (12): General (1): Spells (4): Sideboard (Omitted/Cut card ideas):
1 Basalt Monolith 1 Mairsil, the Pretender 1 Cauldron of Souls 1 Palladium Myr
1 Coveted Jewel   1 Helm of the Host 1 Eater of the Dead
1 Doubling Cube Creatures (47): 1 Staff of Domination 1 Blighted Bat
1 Dreamstone Hedron 1 Myr Propagator 1 Strionic Resonator 1 Falkenrath Aristocrat
1 Hedron Archive 1 Myr Welder   1 Marchesa's Smuggler
1 Gilded Lotus 1 Phyrexian Devourer   1 Jawbone Skulkin
1 Grim Monolith 1 Retrofitter Foundry   1 Rage Weaver
1 Khalni Gem 1 Soliton   1 Endbringer
1 Mana Vault 1 Soul of New Phyrexia    
1 Prismatic Geoscope 1 Grenzo, Dungeon Warden    
1 Pyramid of the Pantheon 1 Havengul Lich    
1 Thran Dynamo 1 Mercurial Chemister    
  1 Nin, the Pain Artist    
Lands (36): 1 Niv-Mizzet, the Firemind    
1 Underground Sea 1 Olivia Voldaren    
1 Badlands 1 The Scarab God    
1 Volcanic Island 1 Avatar of Woe    
1 Watery Grave 1 Crypt Rats    
1 Blood Crypt 1 Dark Impostor    
1 Steam Vents 1 Shauku, Endbringer    
1 Sunken Hollow 1 Geth, Lord of the Vault    
1 Smoldering Marsh 1 Minion of Leshrac    
1 Fetid Pools 1 Necrotic Ooze    
1 Canyon Slough 1 Pack Rat    
1 Choked Estuary 1 Pestilence Demon    
1 Foreboding Ruins 1 Skithiryx, the Blight Dragon    
1 Sunken Ruins 1 Thrashing Wumpus    
1 Graven Cairns 1 Unliving Psychopath    
1 Cascade Bluffs 1 Visara the Dreadful    
1 Drowned Catacomb 1 AEtherling    
1 Dragonskull Summit 1 Arcanis the Omnipotent    
1 Sulfur Falls 1 Argent Sphinx    
1 Crumbling Necropolis 1 Galecaster Colossus    
1 Command Tower 1 Gigantoplasm    
1 Path of Ancestry 1 Horseshoe Crab    
1 Reflecting Pool 1 Mercurial Pretender    
1 Spinerock Knoll 1 Mirror-Mad Phantasm    
4 Swamp 1 Morphling    
4 Island 1 Quicksilver Elemental    
3 Mountain 1 Sakashima the Impostor    
1 Sol Ring 1 Sphinx of Magosi    
1 Mana Crypt 1 Crimson Mage    
  1 Hateflayer    
  1 Hoard-Smelter Dragon    
  1 Kamahl, Pit Fighter    
  1 Skyship Stalker    
  1 Spikeshot Goblin    
  1 Torchling    
  1 Viashino Heretic    
  1 Whip Sergeant