There’s an excellent monogreen Nissa available as well, but why not use blue? Actually, I’d rather use a monocolored deck in this particular environment, but I do have a fondness for Simic. Maybe we’ll get back to the other options later on. There’s [card]Rashmi, Eternities Crafter[/card] as well.

This particular color combination is also interesting, because green can fix mana so much better than the other colors. Nissa lends itself to ramping quite well, so we should take that route.

[draft]Channeler Initiate
Drover of the Mighty
Druid of the Cowl
Naga Vitalist
Rishkar, Peema Renegade
Servant of the Conduit
Weaver of Currents
Ranging Raptors[/draft]

I like these, because some of them are also quite potent attackers as well. Not all of them actually fix mana, but three of them do, and one sort of does as the [card]Naga Vitalist[/card] can be useful, when you need double mana for something.

Personally, I’m not very big on the new ramp enchantments, but there are some worthwhile Sorceries for this.

[draft]Thunderherd Migration
Spring // Mind
Harvest Season[/draft]

Next, we’ll need something to ramp into.

[draft]Rashmi, Eternities Crafter
Ripjaw Raptor
Carnage Tyrant
Champion of Wits
Honored Hydra
River’s Rebuke
Bounty of the Luxa
Curator of Mysteries
Emperor’s Vanguard
Ghalta, Primal Hunger
Glyph Keeper
Nissa, Vital Force
Rhonas the Indomitable
Sandwurm Convergence
Vizier of Many Faces
Verdurous Gearhulk
Vizier of the Menagerie
Skysovereign, Consul Flagship
Walking Ballista[/draft]

We have some tools for card advantage here, but let’s add a little bit more of that, as well as some selection to help with Nissa’s 0-ability.

[draft]Treasure Map
Lifecrafter’s Bestiary
Overflowing Insight
Rishkar’s Expertise
Jadelight Ranger
Merfolk Branchwalker[/draft]

I might be overdoing the draw elements of the deck here a smidge, but… sure. We don’t have much room for anything else. supposing this deck plays 24 lands, which sounds about right with all the ramp, we have two more spots. That would be the right place for a few answers. Since we have [card]Thunderherd Migration[/card] in the deck, as well as [card]Drover of the Mighty[/card], it’s not a bad idea to add a few dinosaurs (which we have way too few off) to the deck.

[draft]Thrashing Brontodon
Deathgorge Scavenger[/draft]

[deck]
[commander]
Nissa, Steward of Elements
[/commander]
[planeswalkers]
Nissa, Vital Force
[/planeswalkers]
[creatures]
Channeler Initiate
Drover of the Mighty
Druid of the Cowl
Naga Vitalist
Rishkar, Peema Renegade
Servant of the Conduit
Weaver of Currents
Ranging Raptors
Rashmi, Eternities Crafter
Ripjaw Raptor
Carnage Tyrant
Champion of Wits
Honored Hydra
Curator of Mysteries
Emperor’s Vanguard
Ghalta, Primal Hunger
Glyph Keeper
Rhonas the Indomitable
Vizier of Many Faces
Verdurous Gearhulk
Vizier of the Menagerie
Skysovereign, Consul Flagship
Walking Ballista
Jadelight Ranger
Merfolk Branchwalker
Thrashing Brontodon
Deathgorge Scavenger
[/creatures]
[spells]
Thunderherd Migration
Spring // Mind
Harvest Season
River’s Rebuke
Bounty of the Luxa
Sandwurm Convergence
Treasure Map
Lifecrafter’s Bestiary
Overflowing Insight
Rishkar’s Expertise
[/spells]
[lands]
Aether Hub
Botanical Sanctum
Evolving Wilds
Woodland Stream
7 Island
13 Forest
[/lands]
[/deck]