Dauthi Voidwalker is excellent here: it's an evasive clock with shadow, and it exiles cards that would go to their graveyard, which starves Nethergoyf and their other graveyard value. Snuff Out can't touch it because it's black, though their Fatal Push still kills it. Force of Negation gives us a free answer to their noncreature spells (Thoughtseize, Kaito, Force of Will, Daze and so on) on their turn, by exiling a blue card from hand. It only works for free when it's not our turn. On our own Doomsday turn it costs {1}{U}{U}, so it can't protect that turn for free. Daze comes out since by game 2 they'll play around it and we need to actually resolve threats, not just tempo them. Street Wraith is a reasonable cut since we need more interactive/proactive cards against their disruption-heavy plan.