Awesome deck +1

Earthcraft + Squirrel Nest is good for your Aura Shards, Cathars' Crusade, Impact Tremors, Champion of Lambholt and Suture Priest. Tutor with Academy Rector and Plea for Guidance.

Ulasht, the Hate Seed + Blade of the Bloodchief + Ashnod's Altar + Doubling Season / Parallel Lives for infinite.

Essence Warden < Angelic Chorus

Druids' Repository < Earthcraft

Dragonlair Spider < Squirrel Nest

Realm Razer < Academy Rector

Mycoid Shepherd < Plea for Guidance

Sigil Captain < Blade of the Bloodchief

Sprouting Phytohydra < Ashnod's Altar

Thanks for commenting, wlbreda! I really like Plea for Guidance and I hadn't considered Ashnod's Altar until you mentioned it, but it seems like it'll fit in really well!

There are two reasons I would prefer Essence Warden to Angelic Chorus; one is that Warden comes out early game or late game for a low cost, and the main purpose of the lifegain is more to delay death long enough to build up, and gaining too much life paints a massive target on your back. The other reason is that most of my creatures are small enough to start with anyways, so it roughly comes out to be only a small boost to my lifegain in the long run.

Druids' Repository works well with Doubling Season, which is a bonus if they both come out, but your suggestion of Earthcraft is something I would love to trade it out for! The only problem is money, of course! I got my most expensive cards for cheap in various ways, such as my Doubling Season which I got for 18$ while I was in Japan. I'll look in to getting it, though!

Squirrel Nest is one I'll have to look in to getting as well, although I don't know if the spider will be the one getting replaced. And Blade of the Bloodchief is great for that combo you mentioned, but unfortunately I don't focus a whole lot on my creatures dying, and most of them only go down with board wipes... plus my only sac outlets would be Ashnod's Altar once I toss that in, Mycoloth and Bloodspore Thrinax. Oh, and Plaguemaw Beast. But yeah, fun card, tho!

Thanks for all of the suggestions! I got a couple of ideas from you, and even some ideas for decks I'm working on/have yet to be made!

And I just realized now, but Ulasht, the Hate Seed+Cathars' Crusade+Ashnod's Altar is also infinite, but it's infinite colorless mana and enters-the-battlefield triggers, and since Crusade is already involved it makes infinite +1/+1 counters on all of your creatures except Ulasht.

Parallel Lives would add infinite, infinitely large saprolings, and Doubling Season instead would do all that plus Ulasht would also be infinite, so you could activate his damage ability to kill all other creatures.

Love it! +1! There's tons of infinite combos in RGW. Kiki-Jiki, Mirror Breaker + Restoration Angel (Kinda pricey, I know, but both combo on their own with your ETB creatures like Trostani's Summoner) You'll also find that Earthcraft pays for itself in a couple of games even without the combo: worth the 25-30 you spend to get it (I might buy another one soon!)Another one is Midnight Guard/Sunstrike Legionnaire + Presence of Gond/Elemental Mastery. This one has a lot of early staying power because not as many people are familiar with it unless they've played your colors or deck style.

Valor in Akros is an underrated card: No, it doesn't do what Cathars' Crusade does, but it fulfills the same effect in a turn you drop in 4+ creatures.

Sweepers are your Q_Q face. Consider Make a Stand, Dauntless Escort, Selfless Spirit for indestructable as well as Caller of the Claw or Fresh Meat for returning in the face of destruction. I really like Faith's Reward, too since you run so many permanents along side your tokens.

If you're gung-ho about +1/+1 counters, Consider Pyrohemia + Vigor

Gisela, Blade of Goldnight is a huge swinger late game, too and goes with your commander's theme of opponents attacking other opponents.I am a fan of March of Souls over Phyrexian Rebirth just because of the high chance you'll come out with more tokens AND advantage when commander rejoins them.