Stifle is not recommended in this deck, since you want them to have more lands than you to make Wayfarer work as a crazy thinning and tutoring-machine that takes Wastelands and lands. Stifle, in general, at least IMO, is a card on the strong downrise, since it's usual a terrible topdeck lately and can be easily circumvent by good players. The point is that "you play Stifle despites not playing it": everyone expects from a deck packing wasteland and a thing called Wayfarer that your strategy is heavily relying on mana-denial, so they stay open, and not crack their fetches,allowing you to take a bit of time.
@Forbiddian: how do you fight a resolved Grim Lavamancer from Zoo on the draw, if you don't manage to find Stp and you don't have the Fow? It basically screws your tempo plan by either removing Mother before becoming active, and SFM before being able to put down Jittes. It's also really bad for the fatties since it forces you most o the time to not block Apes and Nacatls with your fatties because you know that they will die because of him. The fact that it's easily abused many times and chains well with Bolts , Helixes and such, furthermore, makes BFTender not that great defense against him.
I find him to be the greatest threat Zoo can offer, and it's very difficult to be fought. I even thought to put some Rule of that enchantment that costs 1W and gives all creatures Pro:red, despites knowing that's pretty much a terrible card which would be difficult to find if not as a 3-ofs or without Enlightened tutorss (which are lame to be sided in against Zoo).
Suggestions?