I want to build similar deck but with additional Bolas Citadel wincon. Is it good idea to play slower deck in hulk/derevi stax/ kess doomsday meta?

Just finished sleeving this up last night and I look forward to playing it through out this weekend:D

My only confusion comes from Tainted Pact and Demonic Consultation , are they strictly for Jace, Wielder of Mysteries wins or are they used outside of that? If so for what? Black in cEDH is entirely new to me and I want make sure I am making the most viable decisions when I run into cards. Many thanks in advance.

Thoughts on Dockside Extortionist ? Is he worth it?

I'd say no. he's more at home in a combo list, since he's basically a super-powered ritual (at least in cEDH). 4c rashmi wants reusable mana sources, since this deck wants to either grind for turn after turn or else combo with isochron scepter