Dimir Tempo leans on Force of Will, Daze, and Thoughtseize to disrupt our combo, so Force of Negation gives us a way to counter their noncreature disruption for free on their turn by exiling a blue card. On our own turn it is a hard-cast {1}{U}{U}, so it is best used as a reactive answer rather than as protection for the Doomsday turn. Dauthi Voidwalker is excellent here, exiling cards headed to their graveyard (shutting down escape on Nethergoyf and keeping their Nethergoyfs small) while pressuring their life total under shadow evasion. Fatal Push stays in the deck: Moonshadow and Nethergoyf have mana value 1, and Orcish Bowmasters and Bilbo have mana value 2, so Push kills all of them without revolt. To make room, we trim Street Wraith, Edge of Autumn, and a Consider, since we don't need as many cantrips and filler cards once we're adding proactive disruption. Keep the full combo package intact since we still need to assemble Doomsday through their countermagic.

Ocelot Pride Midrange goes wide with cheap creatures (Ocelot Pride, Ajani tokens, Amped Raptor), so Dauthi Voidwalker provides an evasive clock and shuts off any graveyard recursion, while Orcish Bowmasters answers 1-toughness Cat tokens and punishes extra draws like Sunbaked Canyon. Portable Hole can exile Ocelot Pride, Guide of Souls, or Thalia, all at mana value 2 or less. Daze comes out because their cheap threats and low-curve deck can often pay the extra mana, and Wasteland punishes our nonbasic lands, so the tempo trade is poor. Fatal Push also comes out since Bowmasters and Portable Hole cover the same cheap targets, such as Guide of Souls and Thalia. We're shifting toward a proactive, disruptive creature plan since their deck can out-grind pure combo lines if we tunnel on Doomsday.

Sultai Aluren is a glass-cannon combo deck that wants to resolve Show and Tell into Omniscience/Atraxa or assemble Aluren, so Force of Negation lets us interact for free on their turn to stop Show and Tell, Aluren, or Omniscience. It can't hit their creature spells like Atraxa or Acererak the Archlich, so save it for the noncreature pieces. Orcish Bowmasters punishes their cantrips: it pings once for each extra card they draw from Ponder or Brainstorm. Stock Up doesn't draw, so it won't trigger. Fatal Push and Street Wraith are cut since Push can't reach Atraxa and Acererak returns itself to hand anyway, and we want more interaction. Voice of Victory stays in, since their opponents can't cast spells during our turn, which keeps Force of Will and Aluren plays off the table when we go for Doomsday. We are racing to assemble our own Doomsday before they go off, so keep the full engine.