This is an aggro Sliver theme deck, as such it doesn't use non-sliver creatues with the exception of Mutavault (As it is a man land). The deck is not super fast as sliver's start out small but then grow into fatties (Hence the name). It uses Winter Orb in combination with either Gemhide Sliver, Aether Vial and/or Lotus Petal to overwhelm the opponent while simultaneously making it difficult for them to play out their strategies.

There are 2 Living wishes in the deck to deal with unforeseen circumstances via wither Volrath's Stronghold or one of the many slivers in the sideboard. There are 3 Toxin Slivers and 3 Ward Slivers so that they can be sided into the deck if need be in game 2 and 3. Legacy Weapon is there to remove any threats the slivers can not otherwise handle, it's expensive but this is a five color deck (Though there are arguably better cards, I choose it because it exiles rather than destroys and it's a repeatable ability). Arena and Volrath's stronghold provide regeneration and creature removal via Living Wish as needed.

The deck is vulnerable to Wasteland and Blood Moon as it runs no basic lands, but that can be gotten around via Lotus Petal, Aether Vial and Gemhide Sliver.

That said the deck is a lot of fun to play as most aggro decks are, and it has some interesting ways to deal with various problems. It's possible to build a stronger Sliver deck I'm sure by incorporating non-sliver cards or going the old Counter Sliver route with or without Hibernation sliver, but that wasn't the theme I was going for with this deck.