Personally, I am looking at a Desert theme for HOD. With the land from graveyard Naga, it looks like there will be quite a few sneaky tricks available...
With 15 new deserts to choose from, you should have lots of options on which way to sneakify. It's a cool new way to have lands be more than
dead cards when they are your turn 8 draw in a grindy match.
I use
Grasping Dunes from Amonkhet in my -1/-1 counter deck. It is nice to be able to use it later in the game for synergy with the other cards in that deck, but sacrificing it early is
rough in a deck with only 22 lands.
I'm interested in the cycling
desert cycle, and a U <> deck, using some of the blue cards from amonkhet that reward cycling with eldrazi or artifacts. Haven't focused enough on it to find specific ideas, but I wholeheartedly agree there will be something there and that naga will make it work. Now i gotta splash for green, I guess