Run at least 1 Sylvan Library and 1 more fetch land; I really don't like to run more than one Sylvan since multiples do nothing but is a great grab with the Swamp, Dark Rit, Duress, Demonic opener.
I can think of almost no situation where I'd want to tutor for Sylvan Library, when Oath of Druids, Forbidden Orchard if you've already got the Oath, or Necropotence are already options.
I played with 3 Chromatic Sphere's in hopes of speeding up the deck and they are somewhat usefull.
The mana-fixing is negligible in a 2 color deck, and beyond that I think they're a lot slower at digging out what you need than the Tainted Pacts that you removed.
The decklist I played had the following mods from Lunk's list:
-2 Tainted Pact
-1 Duress
-1 Cabal Therapy
-2 Cabal Ritual
+1 Sylvan Library
+1 Polluted Delta
+3 Chromatic Shpere
+1 Crop Rotation
+1 Mind Twist
I, too, have added the 5th fetchland to go with the Scroll Racks that I added.
I played with Mind Twist a bit, and it was occasionally very broken, but generally a sub-par Hymn to Tourach or a nice juicy Misdirection target.
I think cutting any Duresses or Cabal Therapies is a major mistake.
I can see the logic on Cabal Ritual, but it's the only card that actually adds mana when trying to play around a Trinisphere, helps to fuel turn 1 Necro or to combo out early before you get 3 permanent mana sources, and is very important if you get a small dump before hitting Witness. They're also great with the Mind Twist that you're running.
Crop Rotation is a nice luxury, but I haven't been able to find the space for it.
One thing to ask however is how is this deck better than control oath?
In a nutshell, because winning now is better than winning 2 or 3 turns from now.
