Spoiler! Hexproof and trample seems good on a big body.
4 out of 5 of the Khans spoiled. At first glance she’s Doran + Leyline of the Void.
I don’t like it quite as much as the Theros trailers, but it’s still pretty good!
Let me start off by saying that I am by no means a professional player (I’m barely involved in competitive play.) I haven’t been playing Magic long enough to play with fetchlands before, so I’ve never seen the benefits firsthand, but the Magic community is absolutely in love with them, so there’s gotta be something going for them. As far as advantages go, you get to grab a land that you need (which thins out your deck, in turn, helping you avoid drawing mana you don’t need mid and late range) and it comes in untapped, which is the main advantage over things like Evolving Wilds. The obvious disadvantage is the paying 1 life part, but that’s hardly a disadvantage. Life total, like cards in your deck, is a helpful resource, and you shouldn’t shy away from utilizing it. Other than that, the only disadvantage is the restrictive price. Even these reprints are 20-plus dollars on StarCity already.
Hope that was a good answer, and thanks for the question!
RUG decks aren’t really my forte, but from what I can tell looking through popular RUG builds, the main strategy doesn’t just factor into mid-range fatties, it simply is mid-range fatties. They all play ramp (Elvish Mystic, Sylvan Caryatid, Courser of Kruphix) and want to ramp into big, good creatures (Stormbreath Dragon and Polukranos being staples.) They like to run Mizzium Mortars or Cyclonic Rift as removal, but rotation is coming up, so they’re going out, but I’ve seen someone suggest Stoke the Flames as a replacement. Planeswalkers are also plentiful in the builds I looked at, and really why wouldn’t they be? So as far as I can tell, just ramp into good stuff and play out the match. Again, I am absolutely not a mid-range player, so this answer probably isn’t all that helpful. Haha. Hope it helped at least a bit, and thanks for the question!