I've chosen to screw the curve for some more control combos—unsure how wise that is.
Magik helps ensure you get that Cerebro. Both Magik and Storm also provide some location control, really necessary for Cerebro decks. Magik —> Storm is stupid strong as well, and so is Storm —> Widow/Negasonic/Brood.
With Goose/Storm, you know where they're gonna play the big money on the last turn, so Rogue/Negasonic/Shadow King become quite easy to deploy, particularly if you haven't dropped Cerebro yet, as you'll likely lose priority.
Most of the suggestions are pretty self explanatory. Sinister can help fill the board. Echo/Iceman/Korg could provide more control. Agony, Forge, or Araña could help fix Cerebro/Mystique, but at what cost? Grandmaster makes Shadow King/Widow/Magik/Storm crazy surprising options as well. But if you really wanna get wacky, Gilgamesh can help provide an extremely unexpected vertical power spike if your opponent hasn't gone wide.