Hearthpwn

This deck started out as a classic secret pally with N'Zoth, the Corruptor thrown in, but after some refining it looks more different than I expected.

When you select Deathrattle minions to revive with N'Zoth, beefier minions are better than small throwaway minions like Haunted Creeper. So the overall curve of this deck is higher, with a stronger midrange centered around the classic Piloted Shredder, Sludge Belcher and Sylvanas Windrunner.

For secrets, Redemption is a lot stronger in this deck because you have a good chance of reviving something with a Deathrattle, so I run two. I'm undecided on the 7th one. Both Competitive Spirit and Repentance aren't that good if you don't have a lot of small minions.

Coghammer is great in Pally decks with beefier minions, so I run one.

I included Polluted Hoarder on a trial basis. I think the card is underestimated somewhat. Card draw is always strong, especially if you're digging for a Challenger, and a 4/2 is very good as additional N'Zoth fodder.

Stalagg and Feugen are in there mainly as more mid-range bodies. I haven't yet managed to pull of a Thaddius with this deck, since games rarely last that long. If you would get both back with N'Zoth though, it's pretty much GG.

Mulligan: Keep Secretkeeper, Shielded Minibot. Keep Aldor or Muster if you have both. Throw back everything else. If you expect a slow matchup (Warrior, Priest), consider keeping a Shredder, Coghammer, Truesilver or Challenger.

Why no Dr. Boom? I've removed him for now because I don't want Boom Bots in my N'Zoth revive queue, possibly preventing a second Sylvanas or Tirion. It's probably not a big deal though.