Cutting the citadels makes sense for adding a color but they are so hard to deal with I don’t know if it’s a good plan. What cards would you like to add in this second color (presumably black)? I untap lands all the time with Nissa because it helps clear the board with Polukranos or Chord for more, etc.

The point with See the Unwritten is that you don’t want too many spells. This card specifically might be good enough that it needs included though. I want to test it for sure.

If you work on a two color version, I’d love to see it at some point. If you have time please post it.

How often are you untapping forests with her ability though? Keep in mind that you’d probably be cutting the Darksteel Citadels if you’re splashing a color, so technically you’d only be losing a net of 1 Forest (based on your list).

Regarding Genesis Hydra, you can’t put Chord of Calling into play with it either, and neither Chord nor See can put Genesis Hydra into play (unless you want it to instantly die). My main concern is feel bads when you See the Unwritten for 8 cards and have to bin 1 or more Genesis Hydra instead of shuffling it back into your deck. Though it should be noted that Nissa does turn on Ferocious for it.

Agree with you on the green titan, especially if you are splashing red and/or running Voyaging Satyr, since it gives you something to do with your spare mana every turn.

Splashing a color is easy, you’re right, but I think you don’t want to so that Nissa is as good as she can be. Untapping 4 forests is busted so by lowering the count of forests, your NIssa would become less powerful.

When I wrote this, See the Unwritten wasn’t spoiled. I think it could replace Garruk for the Six mana awesome spot, but I don’t like that you can’t put it in play with Genesis Hydra. Also I think the new green titan should make his way back into this deck.

Also, seems like it wouldn’t be too hard to splash a 2nd color, just replace 4 Forests with Temples and add a few Mana Confluences if needed. You have 4 Caryatids, after all.

My main problem with green devotion is that your removal is limited, so I prefer to splash a color like black for additional removal options. Black gives you Garruk and Pharika, should you go the Eidolon of Blossoms route, while red gives you Xenagos PW, Xenagod, Generator Servant, Chandra Pyromaster, and/or Soul of Shandalar. Either of them could add Scuttling Doom Engine or Soul of New Phyrexia if needed.

the dredge deck is more resilient than you’d think. I crushed lots of events with it when born of the gods came out. Try it out, I think you’ll like it if you give it a shot.