I think Tarmogoyf fits perfectly in this deck and its philosophie. Its fast, most of the time BIG (4/5 for Stubborn Denial) and cheap. Sometimes I think this deck is missing a couple of beaters when 1-2 allready got removed and the third one is being in your GY because of a Thought Scour. With an addition of Tarmogoyf you make it a little bit more consistent because you play 14 instead of 12 creatures now. Furthermore with green you get Maelstrom Pulse which can be quite devestating if it kills 2 for 1. Also it works against other non creature cards like artifacts, enchantments, Planeswalker etc.
It looses a little bit of speed since you don't play Temur Battle Rage or Kolaghan's Command. Last is great but Temur Battle Rage sometimes just doesn't hit right when you need a creature instead and the only one you got is Snapcaster. In general Terminate is better than Fatal Push and Abrupt Decay for creatures but for this you have 2 Maelstrom Pulse and an other 1 in the board which substitute it good imho. I don't really see a lot of Lightning Bolt being played so you don't even miss the best Burn spell.
Anyone tested it before?