I have been working with Meandeck Tendrils lately. In the linked article, Stephen Menendian indicated that while the decklist was tournament legal (at the time), it was not possible to play it in a tournament, as:
The primary reason it's unviable is because you have to compress all of the numerous decisions of a typical Vintage game into the space of one turn - and do that in a reasonable amount of time."
Can someone explain this reasoning? I am unfamiliar with tournament timing rules, and don't even know where to begin to understand his claim. Note, in case it's important, the card list for his deck is below.
This paragraph is added after many comments were made on the original question. I'm not so interested in a detailed analysis of this deck per se (My version of this deck differs considerably from Stephan's). I'm interested in why would a deck that's a 66% first turn kill be slow to play? That said, Stephan's decklist is hard to play. My best guess, is that his deck takes at least 5 hard decisions on average, (8 worst case) to play through it's various lines of play. That is just goldfish play, I have no experience playing against Force Of Will, or other disrupters. So, it appears Stephan's argument is,
You just can't play this deck enough to automatically know how to make all those hard decisions. Moreover, those hard decisions take a lot of time, and you will be too slow for a real tournament.
I can buy that. The dude has experience (as pointed out in the answers or comments below). I have none. If I'm missing something about tournament rules, and how slow play works in tournament rules, I'd like to know it. The answers below do an excellent job of capturing that.
1 Bayou 1 Polluted Delta 1 Tropical Island 1 Black Lotus 4 Chromatic Sphere 1 Chrome Mox 4 Darkwater Egg 1 Lion's Eye Diamond 1 Lotus Petal 1 Mana Crypt 1 Mana Vault 1 Mox Emerald 1 Mox Jet 1 Mox Pearl 1 Mox Ruby 1 Mox Sapphire 1 Sol Ring 1 Ancestral Recall 4 Brainstorm 4 Cabal Ritual 4 Dark Ritual 1 Demonic Consultation 4 Repeal 4 Spoils of the Vault 1 Vampiric Tutor 1 Demonic Tutor 1 Imperial Seal 4 Land Grant 3 Night's Whisper 4 Tendrils of Agony 1 Yawgmoth's Will