Undying Persist

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Click here for my EDH Commander decks
 
Undying
Persist
Remove counters
Whenever creature enters/leaves ...
Clones (you can alternate between making them Undying and Persist, so they can die over and over)
This deck can very easily go infinite with repeatable sac outlets (e.g. Goblin Bombardment, Phyrexian Altar). I purposely left them out, so the deck isn't so degenerate, but you can see some of them in the Sideboard.
 
Mana Acceleration (12): General (2): Spells (11): Sideboard (Omitted/Cut card ideas):
1 Astral Cornucopia 1 Ludevic, Necro-Alchemist 1 Cauldron of Souls 1 Retribution of the Ancients
1 Chromatic Lantern 1 Reyhan, Last of the Abzan 1 Power Conduit 1 Lesser Masticore
1 Coalition Relic   1 Golgari Germination 1 Putrid Goblin
1 Everflowing Chalice Creatures (39): 1 Black Market 1 Endling
1 Prismatic Geoscope 1 Rattleblaze Scarecrow 1 Open the Graves 1 Quicksilver Gargantuan
1 Frontier Siege 1 Gravelgill Axeshark 1 Durable Handicraft 1 Relentless Skaabs
1 Hunting Wilds 1 Lazav, the Multifarious 1 Gutter Grime 1 Clever Impersonator
1 Mana Reflection 1 Quillspike 1 Ulvenwald Mysteries 1 Phyrexian Metamorph
1 Ranger's Path 1 Scuzzback Marauders 1 Ion Storm 1 Novijen Sages
1 Recross the Paths 1 Sek'Kuar, Deathkeeper 1 Vicious Shadows 1 Lurking Predators
1 Skyshroud Claim 1 Shapers of Nature 1 Warstorm Surge 1 Solemnity
1 Zendikar Resurgent 1 Soul Diviner   1 Feed the Pack
  1 Trapjaw Kelpie   1 Cryptoplasm
Lands (36): 1 Zameck Guildmage   1 Stunt Double
1 Underground Sea 1 Demonlord of Ashmouth   1 Skullclamp
1 Badlands 1 Geralf's Messenger   1 Infernal Tribute
1 Taiga 1 Grim Haruspex   1 Altar of Dementia
1 Bayou 1 Harvester of Souls   1 Ashnod's Altar
1 Tropical Island 1 Mikaeus, the Unhallowed   1 Phyrexian Altar
1 Volcanic Island 1 Ogre Slumlord   1 Attrition
1 Watery Grave 1 Pawn of Ulamog   1 Evolutionary Leap
1 Blood Crypt 1 Puppeteer Clique   1 Perilous Forays
1 Stomping Ground 1 Sifter of Skulls   1 Goblin Bombardment
1 Overgrown Tomb 1 Vengeful Vampire   1 Champion of Stray Souls
1 Breeding Pool 1 Geralf's Mindcrusher    
1 Steam Vents 1 Glen Elendra Archmage    
1 Sunken Hollow 1 Mercurial Pretender    
1 Smoldering Marsh 1 River Kelpie    
1 Cinder Glade 1 Sage of Fables    
1 Fetid Pools 1 Sakashima's Student    
1 Canyon Slough 1 Vesuvan Doppelganger    
1 Sheltered Thicket 1 Vesuvan Shapeshifter    
1 Choked Estuary 1 Aerie Ouphes    
1 Foreboding Ruins 1 Howlgeist    
1 Game Trail 1 Melira, Sylvok Outcast    
1 Drowned Catacomb 1 Soul of the Harvest    
1 Command Tower 1 Woodfall Primus    
1 Exotic Orchard 1 Vorapede    
1 Gaea's Cradle 1 Flayer of the Hatebound    
1 Grim Backwoods 1 Furystoke Giant    
1 High Market 1 Hound of Griselbrand    
1 Keldon Necropolis 1 Nearheath Stalker    
1 Miren, the Moaning Well 1 Thunderblust    
1 Mosswort Bridge      
1 Path of Ancestry      
1 Phyrexian Tower      
1 Reflecting Pool      
1 Spinerock Knoll      
1 Westvale Abbey // Ormendahl, Profane Prince      
1 Sol Ring