I like the idea of saccing things to get loads of mana, so I think I'll add 3 Soldevi Adnate. It's basically Priest of Yawgmoth, but it also lets us sac non-artifact creatures for mana. Also, I figured out the decklist thing, lol.
Before I tell this story, I just want to make it clear that my playgroup is very casual. I was playing 1v1 against a buddy of mine who was using a Lazav, Dimir Mastermind mill/control deck. I was running Roon of the Hidden Realm flicker-fest. He had just hit me with Traumatize, and had out Lazav copying Treva, the Renewer and a 67/67 Consuming Aberration. I had a Wall of Blossoms, Conjurer's Closet, and a Galepowder Mage. I draw into Chancellor of the Spires, and cast it, fully intending to traumatize him right back and hopefully mill him into something more powerful. While going through his yard, I notice that there is a Cackling Counterpart in there that he had cast at the beginning of the game. So, I figure "Cool, I get a token to chump block the Aberration with, and I can traumatize him." Then I remember that the chancellor doesn't exile the card I cast with it. End result: 500 trillion 5/7 sphinxes, and a traumatize off the last one, which still left him with about 50-ish cards in his deck, but I had combat damage win next turn, unless he boardwiped. So, combat phase, I attack with my mage, blink the Original Chancellor, then when it came back at the end phase, I saw that I had milled a Psychic Spiral when I used his traumatize against him and I had PLENTY enough cards in my Grave to mill him out.
Created this account just so I could post here, so I apologize for not knowing how to format the decklist. I really like the idea of this deck. I'll add 4 Ichor Wellspring. They make great sac targets for both Yawgmoth and his priests, and help us draw into more things. Once again, glad to officially be a member of the forum, and sorry about the lack of a decklist with my post.
4 Priest of Yawgmoth
3 Soldevi Adnate
4 Myr Retriever
4 Moriok Rigger
2 Salvage Titan
4 Yawgmoth Demon
2 Scuttling Doom Engine
4 Perilous Myr
4 Disciple of the Vault
4 Executioner's Capsule
4 Ichor Wellspring
3 Puppet Strings
2 Loxodon Warhammer
1 Trading Post
2 Ugin's Nexus
1 Spine of Ish Sah
1 Demonic Tutor (1 @ -1)
1 Yawgmoth's Bargain
Lands: 24
18 Phyrexia's Core
4 Vault of Whispers
3 Mishra's Factory
2 Urborg, Tomb of Yawgmoth
4 Priest of Yawgmoth
4 Yawgmoth Demon
4 Moriok Rigger
4 Myr Retriever
3 Soldevi Adnate
2 Salvage Titan
4 Executioner's Capsule
1 Spine of Ish Sah
2 Ugin's Nexus
3 Puppet Strings
4 Ichor Wellspring
1 Demonic Tutor
Lands: 24
24 Phyrexia's Core