I made this deck initially to see what this guy was talking about on this deck: http://tappedout.net/mtg-decks/21-12-14-organized-chaos/

And in the act was struck with inspiration. Mill had always been the first mechanic I gravitated towards as a new player - could it potentially work here again in standard?

No. This is completely gimmicky, but it's fun and unexpected to play. Bring a camera, capture the unforgettable looks that other players make when you play Aerie Worshippers or Riptide Chimera. Beyond those powers, here's the rest of the deck.

Openings are simple and direct. Despise your enemy aggressively, or simply Nullify or Negate everything she does. Baleful Eidolon protects against most aggression due to deathtouch, and Returned Phalanx builds into an effective hitter mid-game. Cast these spells freely, openly.

Mid-game you need to maintain some subtlety, so maybe sacrifice a Baleful to keep attention elsewhere, because your goal should be on getting Grim Guardian out early, and keeping him alive as long as you can. Getting his constellation mechanic to trigger is key here, but simply secondary to keeping him alive.

Countermand is to be used sparingly at this stage. If possible put down a Bident of Thassa instead, unless you're already in dire straits healthwise (haha! Won't save you anyway, probably.) That way you can get card draw and constellation mechanic to proc. Riptide Chimera can be used now to start bouncing Balefuls and Grims as opportunities arise.

Thassa, God of the Sea and Phenax, God of Deception are your two main heavy hitters, supplemented by Thassa's Devourer and Nighthowler. Both play into the two ultimate win conditions: smacking your opponent to death with unblockable swings, or milling them to death (via Riptide+constellation or tapping via Phenax).

All the +1 ups in the sideboard I typically add in after the first round. The +2 ups I add in and adjust as needed--and of course at the availability of my camera for Aerie Worshippers candid shots..