The mana package
Axebane Guardian is the core of the mana generation, with each defender your win condition becomes that much closer.
Overgrown Battlement is redundant mana to supplement axebane. Four toughness also makes him less prone to burn.
Defenders
Sylvan Caryatid is optimal mana fixing while still adding to the defender count.
Wall of Blossoms The cantrip on a creature hype is real. You will never feel bad about drawing wall of blossoms.
Drift of Phantasms I would argue phantasm is the glue that holds the deck together. Transmuting him can grab any piece of your combo. (Or play him for a flying blocker and to add to your defender count mana.)
Kruphix and company
Prophet of Kruphix is obviously amazing, allowing you to flash in creatures and always have mana open to respond to threats. Untaping your mana producing creatures will allow you to rule the table with a capsize or just about anything else in hand.
Kruphix, God of Horizons flashing him in online is sweet. But what really matters is the mana storage for your "x" cost spells. with prophet also out you can store an insane amount of mana on everyone else's turn.
other includes
Capsize is threat removal, and deterrent to your opponents. But can lock down the board with infinite mana. This card is abusable and will most likely be removed with more casual groups. With great mana comes great responsibility.
Golgari Charm was a questionable pick, but it has proven to be a sweet addition. Between its removal and protection of your precious mana generating defenders,it's great for sweeping away early aggro. the charm has saved my bacon more times than I can count. Serious tech
Sultai Charm removal options and cantrip in a pinch. great versatility.
Treasure Cruise I hear it's a good card and was banned in modern or whatever. . .
But seriously it's really cheap gas, play it.