Orzhov Control combines discard (Thoughtseize), removal (Fatal Push, Vanishing Verse, Get Lost), and planeswalkers (The Wandering Emperor, Elspeth, Storm Slayer), so protecting your threats from cheap removal is crucial. Change the Equation costs {1}{U} and counters their Fatal Push or any other spell with mana value 2 or less, including Thoughtseize, Vanishing Verse and Get Lost. Ashiok, Dream Render's -1 mills four cards and exiles their graveyard, which shuts off recursion like Takenuma, Abandoned Mire's channel ability. Torch the Tower and extra Boomerang Basics are weaker here since their creature count is low and their removal suite answers your bounce targets just as easily, so they're trimmed for more resilient interaction.