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So Collected Company is a dumb card, one that screams combo finder. I took inspiration from FadedHerbivore's deck which you can find here: http://www.mtgvault.com/fadedherbivore/decks/infinite-mill-combo-cheap/ As you can see I took it in a different direction, added a few more win cons which come with value attached and which deal damage. This avoids the rather embarrassing moment you mill them for six, they Dig through time and stoke/cut/voyage your guy ^^'. ps this has happened to me :'(
So the combo is target Midnight guard with retraction helix to infinitely bounce ornithopter, at that point you just need any of the cards that work off of etb to win. Purphoros, Impact Tremors and Altar of the brood are easy, Anafenza requires a little more thought. So when the Ornithopter enters the battlefield two triggers happen, Midnight guard's untap, and Anafenza's Bolster. You need to stack the triggers so that the guard untaps first, so that you can bounce the Ornithopter in response to the bolster trigger. This allows you to grow your guard and Kin-tree to whatever size you need to win ;). Anafenza is the weakest combo finish of the four, in that she does not just win you the game. She is however the only one that can be searched for with Collected company which is quite important. Hope you have fun with the deck :)
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