Made some adjustments to the Handbuff DK deck recipe - switched it away from Blood Blood Unholy, for one thing, to focus more on The Headless Horseman and actual buffing, with less control elements. Northern Navigation is the only Frost card in the deck, but it can tutor out the handbuff spells...or the Horseman's Head!

I stripped out a few things, including:

Body Bagger - Don't need Corpses that badly.
Noxious Cadaver - Not a valuable buff target.
Harmonic Metal - Overkill.
Soulbreaker - Don't need Corpses that badly.
Soulstealer - Can't go in a Rainbow deck.
Stitched Giant - Just a ball of stats; no useful traits.

In return, I added:

The aforementioned Northern Navigation.
Crop Rotation - Corpses, clearing potential, plus comboes with Sickly Grimewalker or Acolyte of Death.
Rainbow Seamstress - Great buff target; should've been in the deck already for the Lifesteal and Rush.
Sickly Grimewalker - Useful for removing problems; a top-priority threat for the opponent to deal with.
Gnome Muncher - Excellent buff target; how was this not in the deck already?!

I went 8-2 starting out, so it has some potential...at least on this opening day. I'm not the greatest deckbuilder out there: I'm sure it could be improved upon :)