Ok man, let's dive into what I have brewed up. It's got some pretty nasty stuff here. First things first, I want to be clear with the general direction that I took the deck.

General Gameplan

With Wilhelt, the Rotcleaver as the commander, I think we have a fairly straightforward game plan. We want Zombies to die and we want to generate value from those deaths. We're also going to want to have plenty of"Zombies Matter" and Zombie payoff cards to help our attacks be more powerful. So, nearly every card in the deck was evaluated through this lens. We have lots of cards that drain opponents when things die, to help get across the finish line as well as quite a few spicy combos. I'll break this down into a few categories below.

Zombie Payoffs

If you skim through the list you'll find several cards that say "whenever a zombie you control...", on them. Every single creature in the deck (other than Drivnod, Carnage Dominus) is a Zombie, so it won't be hard to generate value by simply playing the deck. Many of the deck's core needs (card draw, removal, etc) are all generated from our zombie payoffs and tied into the overall theme of having them die. Here are some examples:

Card Draw

• Archghoul of Thraben
• Midnight Reaper
• Undead Augur
• Hordewing Skaab
• Liliana's Standard Bearer
• Village Rites
• Wilhelt, the Rotcleaver

Ramp

• Deadly Dispute
• Phyrexian Altar
• Ashnod's Altar
• Skull Clamp

Removal

• Death Match (works great when you make a ton of decayed tokens)
• Fleshbag Mauraders
• Bone Shards
• Noxious Ghoul

Life Loss

As mentioned, I wanted to have plenty of ways to win besides combat damage. Here are a few of the other cards that I included to move the deck toward victory.

• Diregraf Captain
• Drivnod, Carnage Dominus
• Gray Merchant of Asphodel
• Vengeful Dead
• Bastion of Remembrance

So far I've been trying to illustrate the key elements and the cards that work toward them. The cards mentioned above, along with the army of zombies and lords/evasion granting cards, and the general ability to out-value opponents all fit together like a puzzle toward victory. However, I saved the most potent stuff for last - The combos! And there are quite a few. It may seem like overall but many of them naturally combo with others in the list.

The Combos

What I love about each of these combos is that all of the cards in each one can be played very innocuously too. All of them are good but not overpowered by themselves and each card has a purpose outside of a combo. This means that a. you'll never be drawing dead cards and b. if you want the deck less powerful just don't actually combo off. All the cards will still be a-ok in the deck.

That said, I included a few tutors to help grab combo pieces for you. First, we have Profane Tutor and Grim Tutor which are straightforward. Then I added a copy of Brainspoil too. It can tutor for any five drop in the deck and there are quite a few utility creatures at that CMC. As far as combos go, this can grab Gray Merchant of Asphodel or Havengul Lich which I'll cover below.

1. Gravecrawler + Rooftop Storm + Carrion Feeder

For this one, you'll need all of the cards mentioned above on the battlefield. Then, sac Gravecrawler to Carrion Feeder. When you do, you'll put a +1/+1 counter on Carrion Feeder and get any death triggers you have in play. Gravecrawler's ability allows you to cast it from the graveyard and thanks to Rooftop Storm casting him this way costs zero mana, so you can do it in a loop. This will create infinite enter the battlefield triggers (great with Death Match), infinite death triggers (you win with cards like Diregraf Captain in play), and infinite +1/+1  counters on the Carrion Feeder.

The combo works the same way with Phyrexian Altar or Ashnod's Altar in place of Carrion Feeder and will generate infinite mana in addition to the other things. Furthermore, if you execute any of these with your commander in play you'll generate infinite tokens as well.

As I mentioned though, I didn't set the deck up especially to make use of the infinite mana. If you wanted to gear it more toward that we would add in some nasty x spells. As of now, Phyrexian Altar andAshnod's Altar are here just because they are good cards... They just happen to fit into the combo.

Rooftop Storm also combos very well with Bolas's Citadel. With both in play, you can cast massive amounts of zombies off the top of your library by paying life equal to their mana cost, which, again, is zero thanks to Rooftop Storm.

2. Havengul Lich + Rooftop Storm + Ashnod's Altar + Gray Merchant of Asphodel

You may already see where this is going - You'll start with everything in play and sac Gray Merchant of Asphodel to Ashnod's Altar and gain two colorless mana. Now you can pay one of them to activate Havengul Lich allowing you to recast your Gray Merchant of Asphodel, which cost zero thanks to Rooftop Storm. Not only do you net one mana each time you do this but you'll also be draining your opponents equal to your deviation to black each time. So, infinite mana, life loss/gain, ETB, and LTB triggers.

3. Gray Merchant of Asphodel + Rite of Replication

This one is perhaps my favorite. To pull this off you'll need Gray Merchant of Asphodel on the battlefield
Rite of Replication in hand, and nine free mana to cast a kicked Rite of Replication. When you kick it and target the Merchant you'll create five copies of it... This means your devotion to black is at a minimum of 12. And you'll drain and gain that much for each copy. So, this is nine mana "each opponent loses 60 life!

 Conclusion

It's a little hard to go over every card but I hope this gets the bulk of it across. Skim through the list a few times and makes some notes and we can go over anything that catches your eye that I didn't happen to cover. Overall, the deck played well for me in testing. And if I may say this without too much tooting my own horn, I think this is one of the cooler Wilhelt lists I have seen.

Again, as far as power level, it can be as powerful as you play it. Even though it may seem stacked with combos many are somewhat coincidentally there. For the budget, I believe I am slightly under what we talked about if you take out the price for the cards you already have. If the price does need to come down let me know... I have budget options waiting lol.