The easiest way with this deck is to try and get Call to Adventure to buff Underbelly Ooze, this will hep keep the board clear for you to drop a big minion to hit face with. This will allow enough face damage to clean him out within a couple turns or one/two turns with Blessed Champion which also combined with Underbelly Ooze is too easy.

I am sure there are other better minions to have Duel summon but its pretty hard to loose as it is with the current setup. Might take a couple tries to get the idea of the deck but very simple.