To start, this is for CASUAL play, to have a fun game (and even a laugh) with your friends. When this deck opens and you start throwing down Snow-Covered lands, your friends will think it's a joke. They'll chuckle, and you will, too, knowing that their naivety will soon be their downfall.
Start with Flinthoof Boar, Boreal Centaur, and even Bull Auroch. Your opponents, baffled, will likely let your nonsensical-looking field develop as they duke it out with each other. You will laugh evilly inwardly.
As the Aurochs come out, you still remain pacifistic. Stalking Yeti is thrown in there because it's snow. Who doesn't want snow?
Finally, by turn eight or so, you may be quite low on life, but so are your opponents. You have six Aurochs on the field and you're ready to strike.
Here's where the big guns come out. Mark for Death is great. These Aurochs rip through a field with Avacyn, because some tiny little creature on Avacyn's field is now the only one blocking, and you're swinging with two Auroch Herds, an Aurochs, a Rimehorn Aurochs, and two Bull Aurochs -- two 10/4 Trample, an 8/3 Trample, a 9/3 Trample, and two 8/1 Trample. Awe for the Guilds works well, too. Cleaver Riot becomes another great option. Imagine all those bad boys, and now with Double Strike.
After your "Assault from the Ice Age" is over, go ahead an Fling another Auroch at another opponent, for another potential death.
Now I know what you're thinking. "VintageFTW, I just spent eight turns getting a field together that's not even that impressive. Those Aurochs cost way too much mana."
My answer: Magic is most fun not when you win overwhelmingly every time. It's most fun when you do new and creative things in casual play with your friends. At least, that's just my opinion. This Auroch deck is a unique and fun way to enjoy a game that has become overwhelmed with surprisingly rich strategists who simply cannot be stopped except by equally rich strategists.