So have you never considered Compelling Deterrence for this deck before? Or Ruinous Path? I only mention these as alternative methods to dealing with the Walker problem that doesn't require white. If that works better for you by all means keep at it.

Also, in this type of build would you consider From Under the Floorboards a better version of Gisa's Bidding or just a more expensive one?

Other stuff I see missing from here, but have thought about for my own possible zombie build, which incites my interest include:

Geralf's Masterpiece

Gisa and Geralf

Graf Harvest

Shamble Back?

Thanks for the comment TheRedGoat!!

In a previous version of this deck I had played From Under the Floorboards but I had found it not so cool... yes you gain life and put minimum 3 zombies but they entered tapped and the madness cost is to high because you have to pay 2 black mana for the activation and then x mana... with this deck I found it too slow.. so I decided to put 2 Gisa's Bidding that provides me 2 active zombies.

Honestly I like a lot Gisa and Geralf and I still consider to put it in this deck... the same,me for Shamble Back.

Graf Harvest is good but I think that I don't need it.Geralf's Masterpiece is awesome but slow because I need to pay 4 to reanimate it and then discard 3 cards.. in game I have, if i'm lucky, 6/7 lands so I can't activate madness ability of the card that I discard for example.. but still a 7/7 flyer... I don't know I have to think about it!

Compelling Deterrence: I don't like much this card..Also I have to think about Ruinous Path instead of To the Slaughter.

I hear ya, and I hope you find good luck testing out the siblings if you try them out (though I'm at a loss on where to cut for them).

I would advise not taking out To the Slaughter for Ruinous Path, because while you would gain control of the target you hit, if Kaladesh as a block is proving anything, then instant speed removal is far more helpful. Rather I would only consider the path in place of Sorin as a means of dealing with troublesome walkers that is easier on the mana base in more ways than one. But like I said before, if it works better to have Sorin then don't take him out. He is a great card.

At the end I decided to take out Sorin because I can't play it every time... instead of Ruinous Path I looked at Disallow in order to cuonter not only the walkers but some dangerous spell.. I put also To the Slaughter into sideboard and replaced it with Fatal Push.Thanks for your help!

I would suggest 2 Gisa and Geralf and 2-3 Advanced Stitchwing along with 2-3 Elder Deep-Fiend and 2 Kalitas, Traitor of Ghet.

Lot of changes! The problem is that I can't see what cards I have to remove because in this configuration the deck is balanced between creatures landso and others spells... what do you remove?

What is Cryptbreaker doing now that copter is gone? How effective are Gisa's Bidding and Dark Salvation as well over zombie recursion with Gisa and Geralf and Destruction with Kalitas, you might be able to run more removal with them and still keep a lot of zombies going. I feel like Gisa's Bidding at least has madness, but Dark Salvation seems bad.

Mmm.. I found Dark salvation Not so bad... it helps me a lot... and Cryptbreaker is usefull to put creatures in graveyard and to activate madness ability.. But I will consider very well your suggestion! For now, honestly, I want to try this configuration and see how it works..