I'm not sure the best build for this deck, but the core feels pretty solid.

CORE: Cast Catacomb Sifter or Matter Reshaper, next turn eldritch evolution for Sidisi, hopefully sacking the scion or whatever reshaper made.

From their you get eldrazi displacer and displace sidisi to put together the zulaport cutthroat, brood monitor infinite combo (hopefully you have a blisterpod or a visionary or something in hand to sac as you blink sidisi). Alternatively there is a toolbox to get you out of trouble for both sidisi and eldritch evolution.