Hearthpwn

The strategy is to let him to fill the board with minions that can't attack, Aluneth gives you a great value in the late game, scince Rafaam's hand is full it will burn him 3 cards each turn and soon bring him to fatigue.

Another tip is every time Rafaam use a secret it will be Mirror Entity so have your Eerie Statue in hand.

The most hard part of the match is the early game, try to get some removals and cheap cost minions in your mulligan, if you have a good start the match will be very simple, the only thing that is out of your control are the minions that come from Rafaam's hero power, fortunately we have Entomb in the deck, which is a very good response for big minions that might come around turn 5.