Axebane Guardian/
Overgrown Battlement: The core of the deck. These guys allow us to generate ridiculous amounts of mana, especially in multiples. At four of each, they're a perfect set of build-arounds.
Sylvan Caryatid: A nice piece of mana acceleration that also happens to have defender (for synergy with the Guardian and Battlement) and hexproof, which can be useful with Assault Formation.
Vine Trellis
: Another mana dork with defender is just what we need. Sure, there are other options, like
Wall of Roots
, but the assured four toughness that can help us crank out an Assault Formation win is what grants this card its slot.
Traproot Kami: In theory, the one-drop slots could be filled with typical ramp dudes like Llanowar Elves, but by adding defender, we can ensure safer blocks and have the bonus of generating added value from multiple copies of our main defender rampers. This card also has the added boost of scaling into a powerful threat with Assault Formation, and serves as a solid blocker until then. Overall, an inclusion I would't want to miss.
Jaddi Offshoot: Having a defender creature on turn 1 is an excellent start for this deck, and this isn't a bad candidate. Defaulting to three toughness can be a solid cover for the sometimes less reliable Kami, and the life gain is helpful as additional pillow fort until we can cast something big.