Just got to rank 7 which is a personal record. Mainly by playing renolock
Also dirty rat isn't as good anymore because you see a lot of people teching the pirate cards making you think it's full aggro and then it turns out it's dragon warrior or midrange shaman or miracle rogue and you get screwed by either Ragnaros summon for warrior, 4 mana 7/7 from shaman or tomb pillager for rogue. It's just not so reliable.
It's only a personal opinion though, from my experience in my games it lost me more games than it won me games.
I'd rather depend on winning vs mirrors and other lategame decks so I removed dirty rat and teched in ragnaros. It's really good vs priest because most priests don't play entomb nowadays.