No it isn't (look at the 2nd place; the deck made top8 more than once). It's just a bad plan in a deck that plays Stifle/Waste and it fits white better because you can also board Teeg against Landstill.
The non-Waste base of every Threshold deck but 4/5c can be build to contain 3-4 basics and 8-10 fetches. 2-3 constant mana sources is all you need with this deck.

