Dies to Removal

I haven't touched this list, but I'm not loving all the creatures in it. That's as far as my commentary can go without shuffling up.

I'm assuming you would rather go into caryatid/courser into Temur Monster route or would you just do something different in the colors?

Honestly I am not sure. RUG is in a weird place. I think you need an overdose of huge creatures to make up for your lack of ability to kill your opponents creatures with spells like Junk, BUG or MBA can do, all having access to black. You need to win in combat. Knuckleblade helps. I
think the 6/6 flash guy for 5 would be fine for his stats alone, not so much the counterspell protection.

It also seems bad to have access to all the best planeswalkers and not be playing them (Xenagos and Nissa)

I have done a lot of work with Rabble against the predicted decks of the brave new world and have not been impressed. Does so much better following red aggro creatures that require answers ie Rabble Red, where after the opponent stabilizes you drop a Rabble and they are out of resources. In these new decks it is just a two toughness creature coming down early in the curve and not lining up well against the gold creatures.

I haven't touched this list, but I'm not loving all the creatures in it. That's as far as my commentary can go without shuffling up.

I don't care that Rabble is a lightning rod, it just lines up horribly against every creature being played

Don't think you need Rabblemaster, it has been underperforming in my testing