Hydroblast is dead against Gro-a-tog since it's mono-blue splash black with no red spells or permanents, so it stays in the sideboard. Annul is unnecessary here since their mainboard runs no artifacts or enchantments, so favor pure counter-density. Tsabo's Web does not slow down Polluted Delta because fetchlands are sacrificed upon activation rather than remaining tapped across untap steps. The core plan is to win the counter war and race with Phyrexian Dreadnought before their Psychatog grows out of control, so keep your proactive threats and countermagic at full strength.