Hey Everyone!  This deck is actually decent.  It's not mine, but I did switch out a few cards from the original.  I've hit legend with similar versions a few times, but I recently added Lightforged Cariel, and I'm keeping him in it for now.  Of course you don't need every legendary in this deck.  And I believe 3 of them were free. 

In fact, the only legendaries you need are: Uther of the Ebon Blade of course.  And...yeah.  That's really it.  You need Prince Renathal, but he's one of the free ones. Nozdormu the Timeless, and Amitus, the Peacekeeper are the best of the remaining legendaries imo.  I'm not even sure the others make the deck any better.  I'm always trying out options.  I also like the Sphere of Sapience, but I'll admit I'm a little biased toward that card in general for OTK decks.

How the OTK works (Just in case you don't know)

I'm not going to go over all of the card choices, at least not right now.  But I think you probably already know how the 4 horseman OTK works.  Playing Uther of the Ebon Blade changes your hero power to 4 horseman mode.  Ideally on your next turn you play Garrison Commander, Sing-Along Buddy.  Push that button twice to trigger 2 hero powers and you win.  Period.  It's kinda sick.  Make sure you have the board space for the combo.  ; )

Ideally you play Redscale Dragontamer on turn 2.  Then play Nozdormu the Timeless on turn 4.  Next, you play Uther of the Ebon Blade as soon as you can.  Find Garrison Commander, and Sing-Along Buddy and win the game.  Remember Crystology can draw your Sing-Along Buddy. 

Now I know that seems like a lot.  But this deck has a lot of ways to survive, and often times you don't even need the OTK.  The bottom line is, see what your opponent is doing, and try to counter it - while trying to find your combo.  You have plenty of board clears and card draw.  Plus, Amitus, the Peacekeeper is amazing.  Keep an eye on your hand size, but in general it's ok to burn a few cards.  Just don't burn Uther of the Ebon Blade.  Also, You have 2 copies of the combo pieces to help out against cards like Dirty Rat, and in case you burn one.

Mulligan:

In general, I look for Redscale Dragontamer.  If you have him, look for Uther of the Ebon Blade, and the rest of your combo (Garrison Commander and Sing-Along Buddy).  If not, look for Nozdormu the Timeless, and again keep combo pieces if you find him.  Obviously, keep some removal against aggro decks.  Playing a Time Out! early has helped me out more than I thought it would.  Against control/combo, I'll keep cheap card draw, along w/ Sphere of Sapience. 

Card Substitutions:

As I mentioned above, you only need two legendaries to play this deck: Uther of the Ebon Blade and Prince Renathal.   Amitus, the Peacekeeper and Nozdormu the Timeless are recommended.  You could throw in a Wave of Apathy, Dark Conviction, Crystalsmith Kangor, Cold Feet, Flash of Light, Aldor Peacekeeper, Keeper of Uldaman, Wickerflame Burnbristle, Barricade, Emperor Thaurissan, etc.  Lots of options.  I've tried most of these, but not recently.  When choosing cards, the trick is to balance card draw with removal.  And this version seems close to the sweet spot for card draw, imo. 

Sir Finley, Sea Guide hasn't done much for me, but I'm keeping it for now.  A lot of times it seems useless though.  It's more of a emergency card. 

Imo, this is a tier 2 deck as long as the meta isn't crazy.  Then it goes down to tier 3-ish.  Have fun out there.  And thanks for checking this out.