Hello, this is my first attempt at a Modern Eldrazi Tribal Deck. My goal was to keep it all ELDRAZI. I know there's probably better cards to add to the deck, but, I rarely get to play at FNM or tournaments so I mainly play casual. Plus, I really like Eldrazi :)
To starts, you need to have at least 1 Forest in your opening hand so you have the mana needed to cast: Nest Invader, Ancient Stirrings and Sylvan Scrying as they are very important to this deck.
Having an Endless one or Nest Invader out early provides chump blockers for attacks and can provide early ramp with the Scions from Nest Invader. Expedition Map and Sylvan Scrying find the lands you need and Ancient Stirrings gets you colourless cards you need to provide support: Chalice of the Void, Perilous Vault, All is dust. Or, it will find the big nasty Eldrazi for you.
Conduit of Ruin Finds Eldrazi and lowers the casting cost of your next Creature spell, Oblivion Sower gives you a chance at stealing your opponents lands and thins their deck. The two Ulamog's give you options. (The Ulamog Ceaseless Hunger/Oblivion Sower combo is just nasty! I added: It That Betrays because it just stings when you get your opponents cards, and Spawnsire of Ulamog because it has options for Scions and other Cards if you can get to 20... Plus, I really like these big Nasty Eldrazi cards :)
I have not made a set sideboard as of yet, and welcome any suggestions for this deck. I think it will be fun to play and that's all that matters. If it could be competitive at FNM or a tournament, that would be an added bonus.
Cheers!