Undying Deck:
This deck revolves around aggro and creatures that just won't go away. Using the Undying mechanic allows for my weaker creatures to keep coming back as fooder to block with until I can set my board up for the end game. And to keep recovering my creatures Bioshift, Fate Transfer, and Power Conduit are used in the short game to keep them coming back. All the whjile my foe keeps attacking and killing my creatures they are doing damage back to his own creatures, in most exchanges its an eye for an eye early game.
We use Undergrowth Champion as a sink for all of our +1/+1 counters further fortifying our defenses with yet another creature that can not be killed very easily while still making him big and scary if he is left unchecked. This deck will punish your foes for killing your creatures and it will also punish them for not killing them and not dealing with them.
Creatures like Vorapede and Howlgeist come out big and swinging and and also have undying. so once they are out they are out for the long haul and they can dish out some damage to boot. Especially if you give them Rancor, and Aphotic Wisps for a smooth direct attack and a thrifty card draw.
Creature removal is done through Wasteland Viper giving our creatures a surprise deathtouch and creating more power for them at the same time.
Our endgame is when we get our Creakwood Lieges out and then things start to spiral down hill quick. They will boost all of your creatures generate a free 3/3 Wurm every single turn and the boosts they give are not +1/+1 counters so the undying creatures can still keep coming back with a pump. With all of the +1/+1 counters floating around and the pumps from Rancor and Creakwood Liege you will have some big creatures and lots of them really fast.
This deck comes online at only 4 mana. Naturalize is put in for some artifact and enchantment destruction as well.