Dark City Vault

[Dakkon]

I'm getting back into Vintage lately and really liking the look of building a Steel City Vault deck. However, I'm a bit bored of the usual Force of Will-based decks so I'm looking at making my list more B-based.

Here's a first draft of my current list.

Creatures (4):
1 Inkwell Leviathan
2 Goblin Welder
1 Trinket Mage

Nonmana Artifacts (6):
1 Aether Spellbomb
1 Mindslaver
1 Nihil Spellbomb
1 Sensei's Divining Top
1 Time Vault
1 Voltaic Key

Instants (10):
1 Ancestral Recall
1 Brainstorm
4 Dark Ritual
1 Fire // Ice
1 Mystical Tutor
1 Thirst for Knowledge
1 Vampiric Tutor

Sorceries (13):
1 Balance
1 Demonic Tutor
4 Duress
1 Ponder
1 Regrowth
1 Tendrils of Agony
1 Thoughtseize
1 Time Walk
1 Tinker
1 Yawgmoth's Will

Enchantments (2):
1 Necropotence
1 Yawgmoth's Bargain

Planeswalkers (3):
2 Dack Fayden
1 Tezzeret the Seeker

Mana Rocks (10):
1 Black Lotus
1 Lotus Petal
1 Mana Crypt
1 Mana Vault
1 Mox Emerald
1 Mox Jet
1 Mox Ruby
1 Mox Sapphire
1 Mox Pearl
1 Sol Ring

Lands (12):
4 Gemstone Mine
1 Glimmervoid
3 Mana Confluence
1 Seat of the Synod
1 Tolarian Academy
2 Vault of Whispers

The main aim of the deck is to win via Time Vault combo, but it does have several other win conditions too:

Dark Ritual-based combo with Yawgmoth's Will
Mindslaver lock
Tinker -> Inkwell Leviathan

This is only a first draft and I'm looking for suggestions, though I would like to retain a focus on B rather than going down the Force of Will route.

[Serracollector]

-1 Dack Fayden +1 Tendrils of Agony, and its a little better. I would also drop the Regrowth and 1 Dark Ritual for 2 Thoughtcast. Otherwise looks pretty nice IMO.