Using Yawgmoth's sacrifice ability, the goal of this deck is to provide enough resources and sacrifice value engines for Yawgmoth to pay life, draw cards, distribute -1,-1 counters, and eventually drain all the opponents life totals to zero.
The win-con of this deck comes in the form of its triggered ability drain cards that activate when sacrificing a creature (what I call: value engines). Some of these value engines include: Blood Artist, Zulaport Cutthroat, Bastion of Remembrance and some additional drain can come from ETBs like: Ayara, First of Locthwain and Geralf's Messenger. Some additional sacrifice value engines can come in the form of treasure tokens: Pitiless Plunderer and scrying for better card draw: Shadows of the Past. These last two cards are definitely helpful, but don't win the game, so I didn't want to include many others like them to dillute my draws.
Resources come mostly from tokens, like Ophiomancer and Nest of Scarabs (my personal favorite in this deck and the one I will typically tutor for). Wriggling Grub and Nezumi Linkbreaker are also very efficient token generators for their cost. especially since a lot of this deck's interaction comes in the form of "Return this creature to the battlefield after they die" cards like Undying Malice and Not Dead After All. These cards are intended to protect yawgmoth from all kinds of removal but also can be used to get more value out of death trigger token generators: Undying Evil
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Wriggling Grub
for instance will generate 6 sac resources for a total of only 3 mana! this helps Yawgmoth draw more powerful, more expensive resources to very quickly and unexpectedly outpace your opponents with card advantage (with built in removal too from his -1/-1 counters!).
Some additional powerful combos exist with Archfiend of Ifnir
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Necroskitter
as using Yawgmoth's proliferate ability with these two cards out will hit all your opponents creatures with -1/-1 counters after discrading a card, after which, you proliferate all those -1/-1 counters over and over, repeating this process as many times as needed so to wipe your opponents board, and then taking those creatures for yourself from Necroskitter, whether for ETB triggers, big damage, or even just a resourses to sac.
Undeniably, the best combo this deck has are the undying creatures as you can go infinite with a simple setup of: 2 undying creatures (Geralf's Messenger and Butcher Ghoul are the easiest, but Mikaeus, the Unhallowed can also get it done, albeit, for a hefty mana investment), a value engine (any Blood Artist effect will do, so you can drain your opponents and gain the paid life back immediately) and Yawgmoth, Thran Physician out. First, you sac one of the Undying creatures to Yawgmoth, after which it will return with a +1/+1 counter. Next, sac the SECOND undying creature and put the -1/-1 counter on the FIRST undying creature that currently has a +1/+1 counter, after which the SECOND undying creature will return with a +1/+1 counter. The -1/-1 counter and +1/+1 counter on the FIRST undying creature will cancel out! This means that you can once again sac the FIRST undying creature, putting the -1/-1 counter on the SECOND undying creature, thus cancelling those counters as well, and the FIRST undying creature will ONCE AGAIN return to the battlefield with a +1/+1 counter. this goes infinite. AND it can be as early as a turn 3 WIN if your opponents can't put up a fight in time and you happen to draw the PERFECT hand!
This deck also uses many tutors like Demonic TutorGC, Imperial SealGC, etc. to make sure you can keep up with having the right balance of value and resources on your field such that Yawgmoth doesn't end up dead in the water. This deck can also be very slow to the uptick and make you a very vulnerable target for turn after turn so I wanted to speed it up as quick possible with cards like Mox DiamondGC, Mana VaultGC, Dark Ritual etc. to give you a big explosive turn to keep up with your opponents. Because of the potential Archfiend of Ifnir
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Yawgmoth, Thran Physician
acting as a sort-of board wipe, along with the many tutors in this deck, I felt comftorble sticking with just Mutilate as my only true board wipe as I really didn't want to waste too much space in my hand and the top of my deck with cards that, frankly, are difficult to recover from with this deck. I also have a small amount of recursion which is rare and unexpected here yet also works quite well with Yawgmoth's discard ability, so I felt it necessary to have some backup in the GY with some recussion from spells like Reanimate. Finally, it's stupid easy to weaken your opponents' boards SEVERLY with Dictate of Erebos and Grave Pact, a no-brainer in this deck, although, they will VERY QUICKLY make you the big target on the table if nobody can use enchanment removal as soon as one of them drops.
