Quote If you drop a Mox, you will be dropping a supporting color (since you run Red). Maybe you could drop the Sol Ring...? Outside of Stephen Houdlette with GAT (7th Place), yours is the only build in the thread that really runs it.
For the record, I am Stephen Houdlette. Regarding Sol Ring, I find its ability to cast better Yawgmoth's Will, faster Future Sight, Cunning Wish, Dryad+AK, hard-cast pitch counters, and any number of other card combinations is well worth it. However, I will devote some time to a build with a tighter curve, and no sol ring since many people are adamant about this card.
Quote GAT appears to need no less than 5 Fetch Lands (several builds run 6), and in one case there is a build with 7(!). I think 5 is the right number
I agree that the deck benefits from a large number of fetchlands. However, since I've been running up against increased numbers of Fish, Landstill, Keeper (stifle>chalice), and others that run stifle, I've tried to make the deck less dependent on them. I find that in a four color build, if I run three of each dual, four fetch, on-color moxen, and a City of Brass, the whole thing works pretty well. Thats 18, plus my staples (island, strip, loa, sol ring, lotus), which makes 23. In Waterbury, you'll notice, I didn't run the island. Now I find it necessary. I'm also stuck in a hard spot where I want to cut down on:
1) total mana sources
2) fetches
3) high color specificity (number of spells that require non-blue)
However, there are interdependent relationships that require a certain presence of one to make the other (and the entire mana base) work.
Quote Regrowth almost appears to be a 'win more' card, but was listed in Ben's build, which had the highest finish of the posted decks. I think that may be worthy of note. I play the Regrowth, and find it to be strong enough to warrant a slot, although G.I.'s comments make me think twice about it simply because he's G.I. I'm still unsure about Regrowth, but I'm usually more happy to see it than not.
These are the reasons I don't like Regrowth:
1) Its not good on its own (you've got to play a broken spell first)
2) Its not blue
3) Its sorcery speed
4) In many ways the deck is redundant enough already.
In spite of this, the card is restricted for a reason. I can certainly understand someone running this card. However, until discard or suicide become popular again I won't be one of these people.
In general, DH, I like your approach of deck analysis among top finishers. However, I use this as a point of departure into more theoretical card discussion since we'll never have a large enough sample size to make an empirical approach significant.