I don't think you really need Masticore #2 in order to beat aggro. A single Masticore and the couple of Triskelions you keep recurring using the Welder will do the job. You should run the hudge Phyrexian Colossus instead of Masticore #2. It's really great against Control, and at worse can be a good blocker against a growing Dryad.
I don't like 3 maindeck Sphere of Resistance because It will mainly be only usefull against Tog, if not countered or else. Furthermore, the aditionnal cost can't be paid with mana from Mishra's Workshop even if you are casting an artifact. That's just a rule point. TNT *can* overwhelm Gro-A-Tog just going into beatdown mode so I don't think it's a really good idea to play Sphere of Resistance. Tangle Wire can be a good solution because Gro-A-Tog plays with a few permanents on the board. But you still don't have tutors for it and a creature solution to Tog can be a better thing.
I'm playing a GRu TNT version with a maindeck Waterfront Bouncer and this is good for me if it hits the table. If it is countered, I can recur it with Genesis. Green has no equivalent bouncer, so what do you think of this :
Dawnstrider
{G}
Creature -- Spellshaper
1/1
,
, Discard a card from your hand: Prevent all combat damage that would be dealt this turn.
Green is your main color so you won't have any problems to pay the mana cost. The discard cost is not really a problem once you have survivaled for Squee. Nevertheless, the problem is that Dryads remain on the board and they will eat your Juggys.
Playing Sylvan Library #2 over Regrowth has always been good for me, because you can protect your key cards against Duress and hymn to Tourach by discarding them on the top of your library. It has an incredibly good synergy with all the shuffle effects you have in the deck (fetchlands and Survival), and is another must counter for control decks. This will also allow you to run less Compost in your sideboard. Compost is great against Sui, but you should really own this deck, as a first turn Duress won't remove Mishra's Workshop or Juggys from your hand. Sideboarding a Flametongue Kavu can be useful then to fight Hypnotic Specters or to wreck bad Sui players that keep their Negators maindeck in game #2 and #3 against TNT.
I personnaly prefer Visahino Heretic over the Sex Monkey. Even if it is mana intensive to abuse, it has a lower CC, can be used each turn and is red, which can be useful when playing under a first turn Blood Moon...
I used to play with 3 Wastelands but I found that I really hate drawing them unless my opponent has dropped LoA or Maze of Ith. Maybe cutting 2 for basic Forests can be a good thing. I play 2 maindeck Squee because I face strong Keeper player with Ebony Charms as good Cunning Wish targets, and lots of Sligh or Weenies, and this allow me to keep using Survival with Masticore on the board.
