This deck started out as a mashup of two prebuilt theme decks from Planar Chaos: Endless March and Rituals of Rebirth
Then, as I started tweaking it, it quickly evolved into something with a life of its own. Now it's full of creatures with "come into play" effects, and various resurrection and return to hand effects to keep them bouncing in and out of play. The result has been a deck that's infuriatingly difficult to kill, and thrives in the long game.
Gameplay generally goes like this: First couple of turns involve mana fixing with Terramorphic Expanse and Evolution Charm, and getting Soul Warden & Essence Warden on the board to keep your life total high. The life dorks are often left unchecked, and often negate the efforts of more aggressive decks. Aven Riftwatcher is another creature you can drop fairly early, and in one of the central cards of the deck. The lifegain bonus helps keep your health high, he serves as a great blocker (especailly since he's going to die anyway!), and can even peck through for a few points of damage if your opponent has no flying to block.
In the midgame, the goal is to bring out some larger threats like Siege Rhino and Thragtusk. These heavy-hitters demand a response from the opponent, and have strong enter the battlefield effects as well. Groundbreaker is a little shock I like to throw in now and then to throw the opponent off balance, either by sacrificing one of their strong blockers or running their life total down, putting them on the defensive. Finally, this is where cards like Whitemane Lion, Graceful Reprieve, and Revive the Fallen start becoming useful, allowing you to continually recast cards like Aven Riftwatcher, much to the chagrin of your foes watching your life total climb ever higher or, at the very least, remain unfazed.
But where this deck really shines is the late game. Once your opponent starts topdecking, Harmonize provides some welcome draw. If your foe has managed to hold on to some significant board presence, Duneblast quickly turns the tide solidly in your favor. Try casting it with a couple Deadwood Treefolk on the table, and watch as your hand instantly refills with your best creatures. I tried to include some amount of inevitability with Teneb, the Harvester and Sorin, Lord of Innistrad. Worst case scenario, someone kills Teneb, at which point you can revive her with Beacon of Unrest.
As I mentioned earlier, this deck has proven remarkably difficult to kill, which was its intention. I'm still tweaking it to some extent, but it's ended up working pretty well for me, so I'm not going to mess with it much.