It seems pretty fun, except Green Sun's Zenith searches for a "green" creature, in which you don't have any of, so its kinda useless in there =\
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How about trying -1 Marsh Flat, -3 Swamps, +1 Urborg, Tomb of Yawgmoth, +3 Verdant Catacombs? This way you have more fetch, less likely to get hurt by Surgical Extraction. Also, try taking out the Sign in Blood and Skinrender for Bloodghast and Altar's Reap? That way you have some aggro that keeps coming back with fetches, and an easy sac that comes back for 1B and Draw two? No loss of life, and it doesn't really hurt your creature, since he keeps coming back. Just my suggestion though.
It was made for a Deck Challenge using Progenitus, but I kinda know what you mean. Ideal draw would be Vine Dryad, Elvish Spirit guide, Berserk, Blazing Shoal, a progenitus/reaper king, and then any other multicolor card. Little hard to pull off, but your opponent would never see it coming. Any suggestions on what to modify to make it run smoother maybe?
Sorry dude, but this deck is wayyy to slow. If you are using Tinker in the first place, why not just add in Lotus Petals and other stuff like Sol Ring to mana excel to first turn Blightsteel. Not to mention, add something to give him haste wouldn't be too hard either.