Dismember gives us cheap, efficient removal for Nethergoyf, Orcish Bowmasters, and Bilbo, Thief in the Night without relying on colored mana, since the Phyrexian mana can be paid with life. Unlicensed Hearse is our graveyard answer here: it isn't a creature until crewed, so it can tap the turn it enters to exile up to two cards from their graveyard, shrinking Nethergoyf and stripping the card types it needs to escape. Crew 2 only matters if we want to attack or block with it. Sire of Seven Deaths comes out as clunky top-end against a deck full of Daze and Force of Will that wants to tempo us out rather than race. It That Heralds the End comes out because a fragile 2/2 dies easily to Fatal Push and doesn't pressure a deck full of cheap interaction. Keep Chalice of the Void in since it can lock out their one-mana cantrips and Thoughtseize on the play.