Hearthpwn

At the beginning of his turn, Lord Slitherspear automatically summons a Naga with stats x/x, where x is equal to the turn count.

This deck utilizes Silence and Mass Dispel to silence his increasingly powerful Nagas into a board full of 1/1's.

You also use the plentiful healing mechanics that priest has to offer and Power Word: Glory in order to stabilize and close out the game, because the boss refuses to trade his minions (just heal and go face).

your board should look something like this:

In that image, the enemy board has 2 Power Word: Glory on it. The next turn I entombed the 5/7, and the following turn I silenced the automatically summoned 10/10 Naga with Spellbreaker. This resulted in the boss effectively doing one damage per turn.

To close out the game, you go face once you stablize, because the boss refuses to trade in his minions.

Note: the boss has 2 Sea Reaver, which can mess up your gameplan if you have his Nagas fully silenced, but in testing this deck, he always drew them early or not at all.

GLHF!