I am going to try testing out a Skred Red/Nykthos deck in the next few weeks for fun. I don't know how good it will be, but I think it could do well in certain metagames. It will probably be good against the UWR Geist decks for example. Maybe someday there will be enough goblins for Nykthos to be good there, but I'm more interested in trying big red now.
The green Nykthos deck is okay, but seems more vulnerable to removal and less consistent than the Amulet of Vigor decks. I've seen it and tried it out.
Black seems like it has a lot of the pieces. You can basically play a lot of the BG/x cards. I just don't really see any synergies that make it better. I just don't think casting Phyrexian Obliterator or Gray Merchant is enough.
I mentioned this on twitter before realizing that every article also has a forum thread. Reposting in case other forum members spark an idea from it:
If I were trying Nykthos in Modern, I'd look to play Rewind. It's a shame that things like Snap aren't legal, I'd love to run a deck where pretty much every spell was "free" but you need Legacy to get most of them and I don't think it'd could be legacy viable even with all the untap spells.
I mean, I like the idea, you can Storm off in Pauper (pre-banning) with bouncelands and Snap and friends, but Rewind is probably too reactive for decks that want to be spending the mana on their own turn. Are there other untappers in Modern worth mentioning?