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The Eldrazi transcend the colors of MagicSee the Legacy version of this deck here: http://www.mtgvault.com/duncant/decks/colorless-eldrazi-16post/
It's simple:* Build your mana base as fast as possible, especially using Expedition Map to fetch missing pieces of Urzatron.* Try to get Silent Arbiter out turn 3, so you don't get killed by a mob of creatures. (it also combos really well with Pathrazer of Ulamog) (this is a super high priority if you're facing Zombie Hunt, Splinter Twin, or similar)* If your opponent has permanents out early that you can't deal with, hit them with All Is Dust.* When you've got enough land (hopefully by turn 4 or 5), throw down the big Eldrazi and wreck 'em.Sideboarding:* When facing control or burn, sideboard in Lightning Greaves and Spellskite for Brittle Effigy and Walking Atlas. You can also swap Not of This World for All is Dust if they don't have troublesome permanents.* Prioritize Eye of Ugin instead of Urzatron if they've got lots of hand destruction.* When facing something with land removal, Blood Moon, or similar, sideboard in Everflowing Chalice for Brittle Effigy.* If you're facing something slow, consider replacing Quicksilver Amulet with Everflowing Chalice or Lightning Greaves depending on whether mana ramp or shroud/haste is more important.
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