Keanu, because it's NEOform....yeah it's a real stretch but Monogreen Pitch World just doesn't have the same ring.

4 Allosaurus Rider
4 Neoform
4 Eldritch Evolution
4 Summoner's Pact
2 Griselbrand
4 Borborygmos Enraged

4 Chancellor of the Tangle
4 Simian Spirit Guide
4 Manamorphose

4 Summoning Trap
4 Nourishing Shoal
2 Zacama, Primal Calamity

4 Dryad Arbor
2 Breeding Pool
4 Misty Rainforest
1 Steam Vents
1 Hallowed Fountain
3 Island
1 Forest

Basic idea is clear, it's an Eldritch Evolution deck with 4 extra copies of Evolution. But Neoform being 2cmc inspires me to try to make the deck run as fast as possible. So you want a same-turn kill from Griselbrand-->Shoals-->Second Rider+Neoform/Evolution into Borborygmos and dump your lands.

Borborygmos pitches to Shoal for 8, pitches to Rider, chains into Griselbrand (Evolution) or Zacama (either), and can be hit off Trap. When Griselbrand won't work, Rider can be chained directly into Borborygmos as a solid threat that murders the board constantly and provides incredible reach.

Zacama is carefully chosen based on Griselbrand math. +9 life from starting is two more activations. By the time higher cmcs offer more value, you've drawn your whole deck anyway (minus 3 cards). This is extremely convenient, because it also means Zacama can be Evolutioned from Rider, and either Neoformed or Evolutioned from Griselbrand/Borborygmos.

Summoner's Pact is Riders 5-8 so that we have full redundancy of both combo pieces; and fetches Zacama for Shoal.

Summoning Trap provides protection at one of two vulnerable points in the combo: casting Rider, and casting Neoform. Removal cannot stop the combo since we get to hold priority once Rider is out, and then sacrifice it as part of the cost of the spell. Removal on Griselbrand or Borborygmos can be troublesome, but we can finish their parts in the combo at instant speed in response. If Neoform is countered, you're in trouble but if Rider is countered you at least have the chance to back it up by cheating a free fatty into play.

I don't like the land setup; fetches and shocks affect Griselbrand math and it's difficult to balance the numbers between Borborygmos and so many pitch cards. Simian Spirit Guide feels iffy. He only works with Evolution or Manamorphose, but a fast mana effect is needed to go off Turn 1 or 2, or else it isn't possible to play the second Neoform. I may possibly go to 3 SSG. Another option is adding some number of Fire-lit Thickets to provide a filter.

A singleton Wild Cantor as a Pact target could provide mana fixing, or 2-4 could provide ramp for the combo turn. Not sure about implementation yet.