So, I was tinkering around with this thing yesterday...

3 Thoughtseize
3 Collective Brutality
3 Swords to Plowshares
2 Toxic Deluge

4 Enlightended Tutor
1 Porphyry Nodes
2 Land Tax
2 Scroll Rack
1 Chains of Mephistopheles
1 Oblivion Ring
2 Ensnaring Bridge

2 Rest in Peace
4 Leyline of The Void
3 Helm of Obedience

4 Dark Ritual
1 Chrome Mox

4 Scrubland
4 Marsh Flats
1 Verdant Catacombs
4 Plains
2 Swamp
2 Urborg, Tomb of Yawgmoth
1 Karakas
4 Ancient Tomb

What I'm missing, now that Top is gone, is a tutor-target to go for during the mid-game, when you haven't got either part of the Helm-combo yet.
I'm considering something like Coercive Portal, or Dark Tutelage. My preference goes to an enchantment, due to the current presence of Kolaghan's Command. Tutelage goes well with Scroll Rack.
Less so with the 7 four-cost combopieces, Thoughtseizes and Toxic Deluge, though.

Tax-Rack felt surprisingly good when goldfishing, even if it clashes somewhat with the Ensnaring Bridges.

This build above might also be a little mana-heavy.

Having literally nothing else besides the Helm-combo to close out a game could also be too greedy, perhaps.

Long story short: list requires a lot of testing.
Did anyone else fiddle around with an idea like this since top got the axe?