UPDATED FOR AMONKHET
Rhonas is just disgusting, and this deck leverages him well as a curve topper. The Prototype and Liberator can turn him on, and only the Gnarlwood Dryad is likely to be too small with an activation. And like the Kessig Prowler, he's a great mana sink if you ever get to a late game. Giving trample is even more terrifying.
Early build. Capable of dumping tons of power on the board in a hurry. Or it might give you Prototypes and land tutors that never empty your hand.
Don't dismiss it because of the fourteen lands. This deck wants one land in the opening hand with a land tutor. Turns two through four are where it's going to overwhelm the opponent, with just two or three lands in play. That said, because of the land searching, it's actually not all that rare to see a Kessig Prowler flip. With fourteen lands in the deck.
Gnarlwood Dryad is the most recent addition, taking a spot from Scythe Leopard. While the leopard attacked as a 2/2 more often than the Dryad will get to 3/3, the Deathtouch on the Dryad makes it harder to block, and makes your Nature's Way more effective.
Sideboarding:
Commencement-Feels strange to have a fog in such an aggressive deck, but it's the cleanest answer green gets to CopyCat. As an added benefit it hoses Pummeler decks. Both are heavily represented at my LGS. If these come in, Prototype comes out. Feels bad holding a situational card with him on the field.
Pacifist-Great against control, where it will reliably flip. Paired with a Prototype or Revolted Liberator, it can start swinging right away regardless.
Natural State-Mostly for vehicles. Heart of Kiran, Aethersphere Harvester, and Cultivator's Caravan all outclass most of the creatures here and ruin a race. Maybe Tower as well.
Take Down-Problematic flyers abound in this format. This can handle Aerial Responder, Avacyn, Spell Queller, Selfless Spirit, Drana. Also, thopter tokens chump block for days. This can handle all of those problems.
Heroic Intervention-Fumigate is an annoying card. Radiant Flames too. And creatures with First Strike. This hoses them all, and counters all the one for one removal in the format, except Blessed Alliance. Which is still annoying.
Natural Obsolescence-May be a necessary evil. Skysovereign can do some damage. An opponent that untaps with an Aetherflux Reservoir is tough to beat. Still useful against vehicles too. Don't worry about Scrounger with this card. It can't block and doesn't race us without a lot of help. This slot could easily be a fourth State to just make your removal against Mardu better.
