Some questions with the CS List:
2 Thirst for knowledgeÂ
Why only two?
I played 4, it was a typo.
4 Goblin Welder
Why not 3? You play will, which puts them back into play if they die. 4 is heavy.
You're correct, I found myself siding one out most of the time, 3 is probably the way to go.
1 Pentavus
Nobody has played a real lock component in ages.
Does that mean it's bad? Pentavus can block forever, create an infinite slaver lock, improve the Stax matchup (Stax doesn't like it when you have lots of permanents I hear) and hit hard. This would probably the last fattie I'd consider cutting.
1 Crucible of Worlds
Why play this if you play pentivus? extreme overkill
I don't play any basics and this is a nice solution to that problem. On top of that, Crucible/Strip Mine can steal some games, it's good versus Stax and it's also an infinite slaver lock with the artifact land. That and the fact I can reuse fetchlands is good enough reason to include one.
4 Underground Sea
WAY too heavy
Mmmm, I need a lot of blue mana, wat should I replace them with? Basics?
2 Forbidden Orchard
2 Wasteland
WTF!?  Orchard and wasteland are HORRIBLE in CS. You don't need wasteland, and orchards arn't the correct way to combat Oath.
Well, I can honestly say that they're not that terrible. Wasting an opponents Bazaar, Workshop or Library can be quite good I hear...
And the Orchards... well I just wanted to test them. They're not that bad, since they produce mana of any color and the tokens don't really matter. They also improve the Oath matchup. But overall I wasn't that impressed and they should probably be replaced with some basic islands or so. They're pretty bad against Stax too.
4 Tormod's Crypt
This is WAAAAAAAAAAY to heavy. 2 or 3 max.
Here i don't agree... Crypts are good against Slaver, Friggorid, Dragon, any deck that plays Will... . And they help against that annoying card called Darkblast...