Dragon (Legendary) [Tribal]

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This is a 39 card sub-deck. It is added to the 68 card Main Tribal Deck. Remove the 6 creatures there, and replace the general with Scion of the Ur-Dragon.
 
Mana / Mana Accel. (6): General (1): Spells (6): Sideboard (Omitted/Cut card ideas):
1 Untaidake, the Cloud Keeper 1 Scion of the Ur-Dragon 1 Tatsumasa, the Dragon's Fang 1 Rorix Bladewing
1 Shizo, Death's Storehouse   1 Kaalia of the Vast 1 Tarox Bladewing
1 Minamo, School at Water's Edge Creatures (26): 1 Sarkhan the Mad 1 Where Ancients Tread
1 Vivid Crag 1 Arcades Sabboth 1 Crucible of Fire  
1 Shinka, the Bloodsoaked Keep 1 Bladewing the Risen 1 Dragonstorm  
1 Dragonspeaker Shaman 1 Chromium 1 Day of Destiny  
  1 Crosis, the Purger    
  1 Darigaaz, the Igniter    
  1 Dromar, the Banisher    
  1 Intet, the Dreamer    
  1 Karrthus, Tyrant of Jund    
  1 Malfegor    
  1 Nicol Bolas    
  1 Niv-Mizzet, Dracogenius    
  1 Niv-Mizzet, the Firemind    
  1 Numot, the Devastator    
  1 Oros, the Avenger    
  1 Palladia-Mors    
  1 Rith, the Awakener    
  1 Teneb, the Harvester    
  1 Treva, the Renewer    
  1 Vaevictis Asmadi    
  1 Vorosh, the Hunter    
  1 Kokusho, the Evening Star    
  1 Skithiryx, the Blight Dragon    
  1 Keiga, the Tide Star    
  1 Jugan, the Rising Star    
  1 Ryusei, the Falling Star    
  1 Yosei, the Morning Star