HomeRn wrote: I see a lot of potential here - and also super jelly that you got Nissa's Renewal. You may want to consider going for a mass-green gem generator deck style (like what I go for) since there are a few great adds from BfZ. One of which is a common! If you have Fertile Thicket, put that in. Ultra-cheap cost and instantly gets you two green gems on the board; and the Herald can play it for you immediately.
The Honored Hiearch, while great and all... is only really good when you can actually get a defender/reach blockade in front of him so that you can actually use his renowned effects - which having extra green gems on the board wouldn't hurt. So you might want to consider that since you don't have a natural defender/reach creature in the deck for right now (and since you said you don't have Skysnare or Dyen... you might want to spam the Origins packs until you do - those cards are insanely useful!)
I'd recommend you switch out Joraga Invocation, Sword of the Animist, and Zendikar's Roil. Sword of the Animist, while very useful, is also a big liability to destroy itself if not your other supports... especially with just 2 shield by itself. Joraga Invocation... was something I have never been fond of. It just gets outclassed by Nissa's second ability since it's always there when you have the loyalty saved up. Zendikar's Roil is only going to clog up your board with elementals (this honestly fits better in other decks than the one you're using right now unless you are constantly making green landfalls which isn't easy with just Nissa's Pilgrimage).
Put in both Bring to Light and Nissa's Renewal. Bring to Light is a bit of a gamble, but getting Zendikar Incarnate for 10 mana is a monster of a deal! Nissa's Renewal is a massive mana-generating, burst healing, time-bomb of a spell - 20 green gems is nearly half the board; with that setup, there is almost a guarantee for massive burst of mana gain (and with Zendikar Incarnate on the field, he's going to get huge in a HURRY).
span_argoman wrote: I didn't know Hydra had that limitation. That makes it less useful in your deck then. You definitely want big creatures for your slots though since your mana ramp should be sufficient.
By the way Nissa's deck limitation is 10/5/5 creatures/spells/supports so unfortunately your suggested decklist isn't possible.
Nissa's Pilgrimage is an important early match ramp tool. On the other hand, considering how creature-light your deck has become, you can probably drop Joraga Invocation. As it is you only have 3 creature's even including Zendikar's Roil.