Now that White Weenie has kor skyfisher, spiderman and leonardo I don't believe arms of hadar, drown in sorrow and fiery canonade are viable sideboard cards against this deck.
Looking a little deeper, the only true boardwype in the format seems to be krark clan xaman + deathtouch, and it's weaker version crypt rats + deathtouch.
THIS SUCKS!
I mean you kind lock control deck behind affinity or mono black (maybe with a light splash). Against decks like elfs WW you kind need a clear reset that can be played by turn 3 or 4 or you will be in a very hard place to return.
I'm brewing a UB hard control and it seems to be the last piece of the puzzle. I tried the rat combo but either I have to play rat and pray it stay alive or find a way to get 6 mana before dying to any deck.
Edit: sorry guys, I meant bordwipes in the title, I'm Brazilian and my autocorrector go nuts with English sometimes