Hearthpwn

Only use I have for him is in my Priest Silence deck.  He can combo well with the 0-cost Silence for a turn 5 8/8.  First time I ever saw it was in arena where it cost my opponent many, many cards where I quickly learned Reaver should NEVER be in play without silence on him, unless you can somehow invent a strategy that involves burning cards.

Things like Wailing Soul work real well (though expensive) if you're packing an Ancient Watcher too.

This card is good for a silence deck--Priest, namely, since you can drop 0 cost silences for a turn 2 4/5.  Ancient Watcher works if your deck has -too many silences- because that surplus turns into one beefy early game card.