For me the URw matchups (mentor/YP) are still pretty good. Actually they got a LOT better for me with DRS and dryad militant. I expected to have a little bit of problem with DRS mana-generating, but I've so far not noticed that problem. What I've noticed is that it's inclusion have improved my win rate. Do you guys have ideas for a black splash that would make this deck better? I've been wondering, as I've included a bayou to get the DRS activation mana, if there's something that would be worth splashing the color. I've played against GBxx versions of this deck, but at least in the mirror they were horribly bad, and brought nothing worth splashing for. But maybe there's something there that would make the splash worth it.
I totally agree with wfain in regards to the 3cmc spells, they are just never worth playing. If you play a silver bullet that's 3cmc hoping to get it with survival, well, if you have 4 mana to spend on survival you probably have better things to do. Which may include paying 2 mana on extra survival targets + ingot chewer, or paying 1 mana on other targets and getting thalia into play. Or just paying 4 mana to get 3 vengevine, 1 rootwalla and 1 hollow one into play, which is at the very least ok.
One thing I really was surprised was how good pyroblast has been. I didn't even consider it something in the first time I was getting this deck together, as there's no misstep to fight the "misstep wars". But it seems like usually people don't expect it and sometimes they can't even play around it (too much pressure) and waste their missteps in other 1 drops. And if they force the pyroblast, you kinda countered a force with a 1 mana spell, which is great. That being said, countering a walker, recall, outcome or force with pyroblast in an essentially naya deck is AWESOME!
I've been noticing how good thalia is against the blue decks. That's pretty obvious of course, but what I mean is that I will be trying the 4th copy of it, probably on the sideboard. The "non-combo-dependant" disruption + aggression (on vintage a 2/1 first striker is kind of a bully) have been ridiculous.
Thalia's been great, DRS, pyroblast and no 3cmc spells have become kinda no-brainer to me.