Orzhov Control runs heavy targeted removal (Fatal Push, Get Lost, Vanishing Verse, Skyclave Apparition) and discard (Thoughtseize), so Surrak, Elusive Hunter can't be countered and rewards us with cards whenever they target our creatures with removal. The Stone Brain can strip their copies of Caretaker's Talent or The Queen of Dale, disrupting their value engines across hand/library/graveyard. Kiora, Behemoth Beckoner is vulnerable to their removal-dense plan and doesn't generate enough value on its own here, so it's the easiest cut alongside the extra Polukranos Reborn. Play around Vanishing Verse and Get Lost by not overcommitting single big threats into open mana.